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Vulnerability Details :

CVE-2021-27889

Summary
Assigner-mitre
Assigner Org ID-8254265b-2729-46b6-b9e3-3dfca2d5bfca
Published At-15 Mar, 2021 | 16:57
Updated At-03 Aug, 2024 | 21:33
Rejected At-
Credits

Cross-site Scripting (XSS) vulnerability in MyBB before 1.8.26 via Nested Auto URL when parsing messages.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
▼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:mitre
Assigner Org ID:8254265b-2729-46b6-b9e3-3dfca2d5bfca
Published At:15 Mar, 2021 | 16:57
Updated At:03 Aug, 2024 | 21:33
Rejected At:
▼CVE Numbering Authority (CNA)

Cross-site Scripting (XSS) vulnerability in MyBB before 1.8.26 via Nested Auto URL when parsing messages.

Affected Products
Vendor
n/a
Product
n/a
Versions
Affected
  • n/a
Problem Types
TypeCWE IDDescription
textN/An/a
Type: text
CWE ID: N/A
Description: n/a
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://github.com/mybb/mybb/security/advisories/GHSA-xhj7-3349-mqcm
x_refsource_MISC
http://packetstormsecurity.com/files/161908/MyBB-1.8.25-Remote-Command-Execution.html
x_refsource_MISC
https://blog.sonarsource.com/mybb-remote-code-execution-chain
x_refsource_MISC
Hyperlink: https://github.com/mybb/mybb/security/advisories/GHSA-xhj7-3349-mqcm
Resource:
x_refsource_MISC
Hyperlink: http://packetstormsecurity.com/files/161908/MyBB-1.8.25-Remote-Command-Execution.html
Resource:
x_refsource_MISC
Hyperlink: https://blog.sonarsource.com/mybb-remote-code-execution-chain
Resource:
x_refsource_MISC
▼Authorized Data Publishers (ADP)
CVE Program Container
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://github.com/mybb/mybb/security/advisories/GHSA-xhj7-3349-mqcm
x_refsource_MISC
x_transferred
http://packetstormsecurity.com/files/161908/MyBB-1.8.25-Remote-Command-Execution.html
x_refsource_MISC
x_transferred
https://blog.sonarsource.com/mybb-remote-code-execution-chain
x_refsource_MISC
x_transferred
Hyperlink: https://github.com/mybb/mybb/security/advisories/GHSA-xhj7-3349-mqcm
Resource:
x_refsource_MISC
x_transferred
Hyperlink: http://packetstormsecurity.com/files/161908/MyBB-1.8.25-Remote-Command-Execution.html
Resource:
x_refsource_MISC
x_transferred
Hyperlink: https://blog.sonarsource.com/mybb-remote-code-execution-chain
Resource:
x_refsource_MISC
x_transferred
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:cve@mitre.org
Published At:15 Mar, 2021 | 17:15
Updated At:21 Sep, 2021 | 17:48

Cross-site Scripting (XSS) vulnerability in MyBB before 1.8.26 via Nested Auto URL when parsing messages.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Primary3.16.1MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Primary2.04.3MEDIUM
AV:N/AC:M/Au:N/C:N/I:P/A:N
Type: Primary
Version: 3.1
Base score: 6.1
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Type: Primary
Version: 2.0
Base score: 4.3
Base severity: MEDIUM
Vector:
AV:N/AC:M/Au:N/C:N/I:P/A:N
CPE Matches
MyBB
mybb
>>mybb>>Versions before 1.8.26(exclusive)
cpe:2.3:a:mybb:mybb:*:*:*:*:*:*:*:*
Weaknesses
CWE IDTypeSource
CWE-79Primarynvd@nist.gov
CWE ID: CWE-79
Type: Primary
Source: nvd@nist.gov
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
http://packetstormsecurity.com/files/161908/MyBB-1.8.25-Remote-Command-Execution.htmlcve@mitre.org
Exploit
Third Party Advisory
VDB Entry
https://blog.sonarsource.com/mybb-remote-code-execution-chaincve@mitre.org
Exploit
Third Party Advisory
https://github.com/mybb/mybb/security/advisories/GHSA-xhj7-3349-mqcmcve@mitre.org
Patch
Third Party Advisory
Hyperlink: http://packetstormsecurity.com/files/161908/MyBB-1.8.25-Remote-Command-Execution.html
Source: cve@mitre.org
Resource:
Exploit
Third Party Advisory
VDB Entry
Hyperlink: https://blog.sonarsource.com/mybb-remote-code-execution-chain
Source: cve@mitre.org
Resource:
Exploit
Third Party Advisory
Hyperlink: https://github.com/mybb/mybb/security/advisories/GHSA-xhj7-3349-mqcm
Source: cve@mitre.org
Resource:
Patch
Third Party Advisory

Change History

0
Information is not available yet

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CWE ID-CWE-79
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CVE-2016-9409
Matching Score-10
Assigner-MITRE Corporation
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Assigner-MITRE Corporation
CVSS Score-6.1||MEDIUM
EPSS-0.61% / 69.88%
||
7 Day CHG~0.00%
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Updated-20 Apr, 2025 | 01:37
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
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CWE ID-CWE-79
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CVE-2016-9421
Matching Score-10
Assigner-MITRE Corporation
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Matching Score-10
Assigner-MITRE Corporation
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||
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Matching Score-10
Assigner-MITRE Corporation
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Matching Score-10
Assigner-MITRE Corporation
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||
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||
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7 Day CHG~0.00%
Published-10 Sep, 2008 | 15:00
Updated-23 Apr, 2026 | 00:35
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

Multiple cross-site scripting (XSS) vulnerabilities in MyBB (aka MyBulletinBoard) before 1.4.1 allow remote attackers to inject arbitrary web script or HTML via (1) a certain referrer field in usercp2.php, (2) a certain location field in inc/functions_online.php, and certain (3) tsubject and (4) psubject fields in moderation.php.

Action-Not Available
Vendor-n/aMyBB
Product-mybbn/a
CWE ID-CWE-79
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE-2008-3069
Matching Score-10
Assigner-MITRE Corporation
ShareView Details
Matching Score-10
Assigner-MITRE Corporation
CVSS Score-4.3||MEDIUM
EPSS-0.25% / 48.68%
||
7 Day CHG~0.00%
Published-08 Jul, 2008 | 18:00
Updated-23 Apr, 2026 | 00:35
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

Multiple cross-site scripting (XSS) vulnerabilities in MyBB before 1.2.13 allow remote attackers to inject arbitrary web script or HTML via unspecified parameters to (1) portal.php and (2) inc/functions_post.php.

Action-Not Available
Vendor-n/aMyBB
Product-mybbn/a
CWE ID-CWE-79
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE-2015-8975
Matching Score-10
Assigner-MITRE Corporation
ShareView Details
Matching Score-10
Assigner-MITRE Corporation
CVSS Score-6.1||MEDIUM
EPSS-0.42% / 61.84%
||
7 Day CHG~0.00%
Published-31 Jan, 2017 | 22:00
Updated-20 Apr, 2025 | 01:37
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

Cross-site scripting (XSS) vulnerability in the error handler in MyBB (aka MyBulletinBoard) before 1.6.18 and 1.8.x before 1.8.6 and MyBB Merge System before 1.8.6 might allow remote attackers to inject arbitrary web script or HTML via unspecified vectors.

Action-Not Available
Vendor-n/aMyBB
Product-merge_systemmybbn/a
CWE ID-CWE-79
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE-2015-8976
Matching Score-10
Assigner-MITRE Corporation
ShareView Details
Matching Score-10
Assigner-MITRE Corporation
CVSS Score-6.1||MEDIUM
EPSS-0.32% / 54.65%
||
7 Day CHG~0.00%
Published-31 Jan, 2017 | 22:00
Updated-20 Apr, 2025 | 01:37
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

Cross-site scripting (XSS) vulnerability in MyBB (aka MyBulletinBoard) before 1.6.18 and 1.8.x before 1.8.6 and MyBB Merge System before 1.8.6 might allow remote attackers to inject arbitrary web script or HTML via vectors related to "old upgrade files."

Action-Not Available
Vendor-n/aMyBB
Product-merge_systemmybbn/a
CWE ID-CWE-79
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE-2015-4552
Matching Score-10
Assigner-MITRE Corporation
ShareView Details
Matching Score-10
Assigner-MITRE Corporation
CVSS Score-4.3||MEDIUM
EPSS-0.30% / 52.94%
||
7 Day CHG~0.00%
Published-03 Sep, 2015 | 17:00
Updated-06 May, 2026 | 22:30
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

Cross-site scripting (XSS) vulnerability in the quick edit function in xmlhttp.php in MyBB (aka MyBulletinBoard) before 1.8.5 allows remote attackers to inject arbitrary web script or HTML via the content of a post.

Action-Not Available
Vendor-n/aMyBB
Product-mybbn/a
CWE ID-CWE-79
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE-2015-2333
Matching Score-10
Assigner-MITRE Corporation
ShareView Details
Matching Score-10
Assigner-MITRE Corporation
CVSS Score-4.3||MEDIUM
EPSS-0.30% / 52.94%
||
7 Day CHG~0.00%
Published-18 Mar, 2015 | 14:00
Updated-06 May, 2026 | 22:30
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

Cross-site scripting (XSS) vulnerability in the MyCode editor in MyBB (aka MyBulletinBoard) before 1.8.4 allows remote attackers to inject arbitrary web script or HTML via unspecified vectors.

Action-Not Available
Vendor-n/aMyBB
Product-mybbn/a
CWE ID-CWE-79
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE-2015-2332
Matching Score-10
Assigner-MITRE Corporation
ShareView Details
Matching Score-10
Assigner-MITRE Corporation
CVSS Score-4.3||MEDIUM
EPSS-0.30% / 52.94%
||
7 Day CHG~0.00%
Published-18 Mar, 2015 | 14:00
Updated-06 May, 2026 | 22:30
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

Cross-site scripting (XSS) vulnerability in member.php in MyBB (aka MyBulletinBoard) before 1.8.4 allows remote attackers to inject arbitrary web script or HTML via unspecified vectors.

Action-Not Available
Vendor-n/aMyBB
Product-mybbn/a
CWE ID-CWE-79
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE-2014-5248
Matching Score-10
Assigner-MITRE Corporation
ShareView Details
Matching Score-10
Assigner-MITRE Corporation
CVSS Score-4.3||MEDIUM
EPSS-0.26% / 49.56%
||
7 Day CHG~0.00%
Published-14 Aug, 2014 | 18:00
Updated-06 May, 2026 | 22:30
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

Cross-site scripting (XSS) vulnerability in MyBB before 1.6.15 allows remote attackers to inject arbitrary web script or HTML via vectors related to video MyCode.

Action-Not Available
Vendor-n/aMyBB
Product-mybbn/a
CWE ID-CWE-79
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE-2006-0442
Matching Score-10
Assigner-MITRE Corporation
ShareView Details
Matching Score-10
Assigner-MITRE Corporation
CVSS Score-4.3||MEDIUM
EPSS-0.53% / 67.18%
||
7 Day CHG~0.00%
Published-26 Jan, 2006 | 22:00
Updated-16 Apr, 2026 | 00:27
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

Multiple cross-site scripting (XSS) vulnerabilities in usercp.php in MyBulletinBoard (MyBB) 1.02 allow remote attackers to inject arbitrary web script or HTML via the (1) notepad parameter in a notepad action and (2) signature parameter in an editsig action. NOTE: These are different attack vectors, and probably a different vulnerability, than CVE-2006-0218 and CVE-2006-0219.

Action-Not Available
Vendor-n/aMyBB
Product-mybbn/a
CWE ID-CWE-79
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE-2014-9241
Matching Score-10
Assigner-MITRE Corporation
ShareView Details
Matching Score-10
Assigner-MITRE Corporation
CVSS Score-4.3||MEDIUM
EPSS-1.02% / 77.31%
||
7 Day CHG~0.00%
Published-03 Dec, 2014 | 21:00
Updated-06 May, 2026 | 22:30
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

Multiple cross-site scripting (XSS) vulnerabilities in MyBB (aka MyBulletinBoard) 1.8.x before 1.8.2 allow remote attackers to inject arbitrary web script or HTML via the (1) type parameter to report.php, (2) signature parameter in a do_editsig action to usercp.php, or (3) title parameter in the style-templates module in an edit_template action or (4) file parameter in the config-languages module in an edit action to admin/index.php.

Action-Not Available
Vendor-n/aMyBB
Product-mybbn/a
CWE ID-CWE-79
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE-2008-3334
Matching Score-10
Assigner-MITRE Corporation
ShareView Details
Matching Score-10
Assigner-MITRE Corporation
CVSS Score-4.3||MEDIUM
EPSS-0.29% / 51.88%
||
7 Day CHG~0.00%
Published-27 Jul, 2008 | 23:00
Updated-23 Apr, 2026 | 00:35
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

Cross-site scripting (XSS) vulnerability in MyBB 1.2.x before 1.2.14 allows remote attackers to inject arbitrary web script or HTML via unspecified vectors, possibly involving search.php.

Action-Not Available
Vendor-n/aMyBB
Product-mybbn/a
CWE ID-CWE-79
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE-2023-28467
Matching Score-10
Assigner-MITRE Corporation
ShareView Details
Matching Score-10
Assigner-MITRE Corporation
CVSS Score-6.1||MEDIUM
EPSS-0.16% / 36.55%
||
7 Day CHG~0.00%
Published-22 May, 2023 | 00:00
Updated-21 Jan, 2025 | 15:26
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

In MyBB before 1.8.34, there is XSS in the User CP module via the user email field.

Action-Not Available
Vendor-n/aMyBB
Product-mybbn/a
CWE ID-CWE-79
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE-2019-3578
Matching Score-10
Assigner-MITRE Corporation
ShareView Details
Matching Score-10
Assigner-MITRE Corporation
CVSS Score-6.1||MEDIUM
EPSS-0.23% / 45.74%
||
7 Day CHG~0.00%
Published-06 Jun, 2019 | 18:13
Updated-30 Jun, 2025 | 16:52
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

MyBB 1.8.19 has XSS in the resetpassword function.

Action-Not Available
Vendor-n/aMyBB
Product-mybbn/a
CWE ID-CWE-79
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE-2021-27949
Matching Score-10
Assigner-MITRE Corporation
ShareView Details
Matching Score-10
Assigner-MITRE Corporation
CVSS Score-6.1||MEDIUM
EPSS-0.22% / 43.92%
||
7 Day CHG~0.00%
Published-15 Mar, 2021 | 17:19
Updated-03 Aug, 2024 | 21:33
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

Cross-site Scripting vulnerability in MyBB before 1.8.26 via Custom moderator tools.

Action-Not Available
Vendor-n/aMyBB
Product-mybbn/a
CWE ID-CWE-79
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE-2018-25116
Matching Score-10
Assigner-VulnCheck
ShareView Details
Matching Score-10
Assigner-VulnCheck
CVSS Score-5.1||MEDIUM
EPSS-0.01% / 1.64%
||
7 Day CHG~0.00%
Published-23 Jan, 2026 | 16:47
Updated-09 Apr, 2026 | 14:12
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
MyBB Thread Redirect Plugin 0.2.1 - Cross-Site Scripting

MyBB Thread Redirect Plugin 0.2.1 contains a cross-site scripting vulnerability in the custom text input field for thread redirects. Attackers can inject malicious SVG scripts that will execute when other users view the thread, allowing arbitrary script execution.

Action-Not Available
Vendor-jamiesage123MyBB
Product-thread_redirectMyBB Thread Redirect Plugin
CWE ID-CWE-79
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE-2018-25309
Matching Score-10
Assigner-VulnCheck
ShareView Details
Matching Score-10
Assigner-VulnCheck
CVSS Score-5.1||MEDIUM
EPSS-0.03% / 6.89%
||
7 Day CHG~0.00%
Published-29 Apr, 2026 | 19:24
Updated-01 May, 2026 | 19:15
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
MyBB Recent threads 17.0 Persistent Cross-Site Scripting

MyBB Recent threads 17.0 contains a persistent cross-site scripting vulnerability that allows attackers to inject malicious scripts by creating threads with crafted subject lines. Attackers can create threads with script tags in the subject parameter to execute arbitrary JavaScript in the browsers of all users viewing the index page.

Action-Not Available
Vendor-dragonexpertMyBB
Product-recent_threads_on_indexMyBB Recent threads
CWE ID-CWE-79
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE-2014-1840
Matching Score-10
Assigner-MITRE Corporation
ShareView Details
Matching Score-10
Assigner-MITRE Corporation
CVSS Score-4.3||MEDIUM
EPSS-0.32% / 54.78%
||
7 Day CHG~0.00%
Published-03 Mar, 2014 | 16:00
Updated-29 Apr, 2026 | 01:13
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

Cross-site scripting (XSS) vulnerability in Upload/search.php in MyBB 1.6.12 and earlier allows remote attackers to inject arbitrary web script or HTML via the keywords parameter in a do_search action, which is not properly handled in a forced SQL error message.

Action-Not Available
Vendor-n/aMyBB
Product-mybbn/a
CWE ID-CWE-79
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE-2018-25247
Matching Score-10
Assigner-VulnCheck
ShareView Details
Matching Score-10
Assigner-VulnCheck
CVSS Score-5.1||MEDIUM
EPSS-0.03% / 7.59%
||
7 Day CHG~0.00%
Published-04 Apr, 2026 | 13:51
Updated-20 Apr, 2026 | 14:30
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
MyBB Like Plugin 3.0.0 Cross-Site Scripting via User Profiles

MyBB Like Plugin 3.0.0 contains a cross-site scripting vulnerability that allows attackers to inject malicious scripts by creating posts or threads with unvalidated subject content. Attackers can craft post subjects containing script tags that execute when other users view the attacker's profile, where liked posts are displayed without sanitization.

Action-Not Available
Vendor-MyBB
Product-thankyou\/like_systemMyBB Like Plugin
CWE ID-CWE-79
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE-2018-25132
Matching Score-10
Assigner-VulnCheck
ShareView Details
Matching Score-10
Assigner-VulnCheck
CVSS Score-5.1||MEDIUM
EPSS-0.03% / 9.43%
||
7 Day CHG~0.00%
Published-23 Jan, 2026 | 16:47
Updated-09 Apr, 2026 | 14:08
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
MyBB Trending Widget Plugin 1.2 - Cross-Site Scripting

MyBB Trending Widget Plugin 1.2 contains a cross-site scripting vulnerability that allows attackers to inject malicious scripts through thread titles. Attackers can modify thread titles with script payloads that will execute when other users view the trending widget.

Action-Not Available
Vendor-zainali99MyBB
Product-trending_widgetMyBB Trending Widget Plugin
CWE ID-CWE-79
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE-2013-7275
Matching Score-10
Assigner-MITRE Corporation
ShareView Details
Matching Score-10
Assigner-MITRE Corporation
CVSS Score-4.3||MEDIUM
EPSS-0.32% / 54.98%
||
7 Day CHG~0.00%
Published-08 Jan, 2014 | 15:00
Updated-29 Apr, 2026 | 01:13
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

Cross-site scripting (XSS) vulnerability in misc.php in MyBB (aka MyBulletinBoard) before 1.6.12 allows remote attackers to inject arbitrary web script or HTML via the editor parameter in a smilie list popup.

Action-Not Available
Vendor-n/aMyBB
Product-mybbn/a
CWE ID-CWE-79
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE-2013-7288
Matching Score-10
Assigner-MITRE Corporation
ShareView Details
Matching Score-10
Assigner-MITRE Corporation
CVSS Score-4.3||MEDIUM
EPSS-0.36% / 57.89%
||
7 Day CHG~0.00%
Published-10 Jan, 2014 | 16:00
Updated-29 Apr, 2026 | 01:13
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

Cross-site scripting (XSS) vulnerability in the mycode_parse_video function in inc/class_parser.php in MyBB (aka MyBulletinBoard) before 1.6.12 allows remote attackers to inject arbitrary web script or HTML via vectors related to Yahoo video URLs.

Action-Not Available
Vendor-n/aMyBB
Product-mybbn/a
CWE ID-CWE-79
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE-2020-15139
Matching Score-10
Assigner-GitHub, Inc.
ShareView Details
Matching Score-10
Assigner-GitHub, Inc.
CVSS Score-8.8||HIGH
EPSS-0.59% / 69.34%
||
7 Day CHG~0.00%
Published-10 Aug, 2020 | 21:35
Updated-04 Aug, 2024 | 13:08
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
XSS in MyBB

In MyBB before version 1.8.24, the custom MyCode (BBCode) for the visual editor doesn't escape input properly when rendering HTML, resulting in a DOM-based XSS vulnerability. The weakness can be exploited by pointing a victim to a page where the visual editor is active (e.g. as a post or Private Message) and operates on a maliciously crafted MyCode message. This may occur on pages where message content is pre-filled using a GET/POST parameter, or on reply pages where a previously saved malicious message is quoted. After upgrading MyBB to 1.8.24, make sure to update the version attribute in the `codebuttons` template for non-default themes to serve the latest version of the patched `jscripts/bbcodes_sceditor.js` file.

Action-Not Available
Vendor-MyBB
Product-mybbMyBB
CWE ID-CWE-79
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE-2018-19202
Matching Score-10
Assigner-MITRE Corporation
ShareView Details
Matching Score-10
Assigner-MITRE Corporation
CVSS Score-6.1||MEDIUM
EPSS-0.26% / 48.94%
||
7 Day CHG~0.00%
Published-11 Apr, 2019 | 20:00
Updated-05 Aug, 2024 | 11:30
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

A reflected XSS vulnerability in index.php in MyBB 1.8.x through 1.8.19 allows remote attackers to inject JavaScript via the 'upsetting[bburl]' parameter.

Action-Not Available
Vendor-n/aMyBB
Product-mybbn/a
CWE ID-CWE-79
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE-2018-15596
Matching Score-10
Assigner-MITRE Corporation
ShareView Details
Matching Score-10
Assigner-MITRE Corporation
CVSS Score-6.1||MEDIUM
EPSS-1.30% / 79.85%
||
7 Day CHG~0.00%
Published-28 Aug, 2018 | 19:00
Updated-05 Aug, 2024 | 10:01
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

An issue was discovered in inc/class_feedgeneration.php in MyBB 1.8.17. On the forum RSS Syndication page, one can generate a URL such as http://localhost/syndication.php?fid=&type=atom1.0&limit=15. The thread titles (within title elements of the generated XML documents) aren't sanitized, leading to XSS.

Action-Not Available
Vendor-n/aMyBB
Product-mybbn/a
CWE ID-CWE-79
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE-2018-14392
Matching Score-10
Assigner-MITRE Corporation
ShareView Details
Matching Score-10
Assigner-MITRE Corporation
CVSS Score-6.1||MEDIUM
EPSS-8.34% / 92.32%
||
7 Day CHG~0.00%
Published-19 Jul, 2018 | 02:00
Updated-05 Aug, 2024 | 09:29
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

The New Threads plugin before 1.2 for MyBB has XSS.

Action-Not Available
Vendor-n/aMyBB
Product-new_threadsn/a
CWE ID-CWE-79
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE-2022-43707
Matching Score-10
Assigner-MITRE Corporation
ShareView Details
Matching Score-10
Assigner-MITRE Corporation
CVSS Score-6.1||MEDIUM
EPSS-0.20% / 41.64%
||
7 Day CHG~0.00%
Published-21 Nov, 2022 | 00:00
Updated-29 Apr, 2025 | 15:15
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

MyBB 1.8.31 has a Cross-site scripting (XSS) vulnerability in the visual MyCode editor (SCEditor) allows remote attackers to inject HTML via user input or stored data

Action-Not Available
Vendor-n/aMyBB
Product-mybbn/a
CWE ID-CWE-79
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE-2019-20225
Matching Score-8
Assigner-MITRE Corporation
ShareView Details
Matching Score-8
Assigner-MITRE Corporation
CVSS Score-6.1||MEDIUM
EPSS-0.24% / 46.38%
||
7 Day CHG~0.00%
Published-02 Jan, 2020 | 14:02
Updated-05 Aug, 2024 | 02:39
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

MyBB before 1.8.22 allows an open redirect on login.

Action-Not Available
Vendor-n/aMyBB
Product-mybbn/a
CWE ID-CWE-601
URL Redirection to Untrusted Site ('Open Redirect')
CVE-2016-9413
Matching Score-8
Assigner-MITRE Corporation
ShareView Details
Matching Score-8
Assigner-MITRE Corporation
CVSS Score-6.5||MEDIUM
EPSS-0.65% / 70.97%
||
7 Day CHG~0.00%
Published-31 Jan, 2017 | 22:00
Updated-20 Apr, 2025 | 01:37
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

The Admin control panel in MyBB (aka MyBulletinBoard) before 1.8.7 and MyBB Merge System before 1.8.7 allows remote attackers to conduct clickjacking attacks via unspecified vectors.

Action-Not Available
Vendor-n/aMyBB
Product-merge_systemmybbn/a
CWE ID-CWE-284
Improper Access Control
CVE-2006-2070
Matching Score-8
Assigner-MITRE Corporation
ShareView Details
Matching Score-8
Assigner-MITRE Corporation
CVSS Score-4.3||MEDIUM
EPSS-8.61% / 92.45%
||
7 Day CHG~0.00%
Published-27 Apr, 2006 | 10:00
Updated-16 Apr, 2026 | 00:27
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

Cross-site scripting (XSS) vulnerability in member.php in DevBB 1.0.0 and earlier allows remote attackers to inject arbitrary web script or HTML via the member parameter in a viewpro action.

Action-Not Available
Vendor-n/aMyBB
Product-devbbn/a
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