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Vulnerability Details :

CVE-2026-66394

Summary
Assigner-VulnCheck
Assigner Org ID-83251b91-4cc7-4094-a5c7-464a1b83ea10
Published At-27 Jul, 2026 | 15:43
Updated At-28 Jul, 2026 | 01:06
Rejected At-
Credits

SiYuan before v3.7.3 Stored and Reflected XSS via SVG Sanitizer Bypass

SiYuan before v3.7.3 contains stored and reflected cross-site scripting vulnerabilities in SVG sanitization that allows authenticated attackers to execute scripts by bypassing the HTML parser-based cleaner. Attackers can hide script tags within desc, style, or noscript elements which the HTML parser treats as raw text but browsers interpret as executable SVG content when served as image/svg+xml, enabling script execution in the application origin.

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)
â–¼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:VulnCheck
Assigner Org ID:83251b91-4cc7-4094-a5c7-464a1b83ea10
Published At:27 Jul, 2026 | 15:43
Updated At:28 Jul, 2026 | 01:06
Rejected At:
â–¼CVE Numbering Authority (CNA)
SiYuan before v3.7.3 Stored and Reflected XSS via SVG Sanitizer Bypass

SiYuan before v3.7.3 contains stored and reflected cross-site scripting vulnerabilities in SVG sanitization that allows authenticated attackers to execute scripts by bypassing the HTML parser-based cleaner. Attackers can hide script tags within desc, style, or noscript elements which the HTML parser treats as raw text but browsers interpret as executable SVG content when served as image/svg+xml, enabling script execution in the application origin.

Affected Products
Vendor
siyuan-note
Product
siyuan
Default Status
unaffected
Versions
Affected
  • From 0 before 3.7.3 (semver)
Unaffected
  • 3.7.3 (semver)
Problem Types
TypeCWE IDDescription
CWECWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Type: CWE
CWE ID: CWE-79
Description: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Metrics
VersionBase scoreBase severityVector
4.09.3CRITICAL
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N
3.18.7HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
Version: 4.0
Base score: 9.3
Base severity: CRITICAL
Vector:
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N
Version: 3.1
Base score: 8.7
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

reporter
JoyGhoshs
Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-99rq-75j6-5j9f
vendor-advisory
https://www.vulncheck.com/advisories/siyuan-before-stored-and-reflected-xss-via-svg-sanitizer-bypass
third-party-advisory
Hyperlink: https://github.com/siyuan-note/siyuan/security/advisories/GHSA-99rq-75j6-5j9f
Resource:
vendor-advisory
Hyperlink: https://www.vulncheck.com/advisories/siyuan-before-stored-and-reflected-xss-via-svg-sanitizer-bypass
Resource:
third-party-advisory
â–¼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
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/siyuan-note/siyuan/security/advisories/GHSA-99rq-75j6-5j9f
exploit
Hyperlink: https://github.com/siyuan-note/siyuan/security/advisories/GHSA-99rq-75j6-5j9f
Resource:
exploit
Information is not available yet
â–¼National Vulnerability Database (NVD)
nvd.nist.gov
Source:disclosure@vulncheck.com
Published At:27 Jul, 2026 | 16:18
Updated At:28 Jul, 2026 | 16:07

SiYuan before v3.7.3 contains stored and reflected cross-site scripting vulnerabilities in SVG sanitization that allows authenticated attackers to execute scripts by bypassing the HTML parser-based cleaner. Attackers can hide script tags within desc, style, or noscript elements which the HTML parser treats as raw text but browsers interpret as executable SVG content when served as image/svg+xml, enabling script execution in the application origin.

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
Secondary4.09.3CRITICAL
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Secondary3.18.7HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
N/A
Type: Secondary
Version: 4.0
Base score: 9.3
Base severity: CRITICAL
Vector:
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Type: Secondary
Version: 3.1
Base score: 8.7
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
Type: N/A
Version:
Base score:
Base severity: N/A
Vector:
CPE Matches

Weaknesses
CWE IDTypeSource
CWE-79Secondarydisclosure@vulncheck.com
CWE ID: CWE-79
Type: Secondary
Source: disclosure@vulncheck.com
Evaluator Description

Evaluator Impact

Evaluator Solution

Vendor Statements

References
HyperlinkSourceResource
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-99rq-75j6-5j9fdisclosure@vulncheck.com
N/A
https://www.vulncheck.com/advisories/siyuan-before-stored-and-reflected-xss-via-svg-sanitizer-bypassdisclosure@vulncheck.com
N/A
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-99rq-75j6-5j9f134c704f-9b21-4f2e-91b3-4a467353bcc0
N/A
Hyperlink: https://github.com/siyuan-note/siyuan/security/advisories/GHSA-99rq-75j6-5j9f
Source: disclosure@vulncheck.com
Resource: N/A
Hyperlink: https://www.vulncheck.com/advisories/siyuan-before-stored-and-reflected-xss-via-svg-sanitizer-bypass
Source: disclosure@vulncheck.com
Resource: N/A
Hyperlink: https://github.com/siyuan-note/siyuan/security/advisories/GHSA-99rq-75j6-5j9f
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
Resource: N/A

Change History

0
Information is not available yet

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Action-Not Available
Vendor-Microsoft Corporation
Product-sharepoint_enterprise_serversharepoint_foundationsharepoint_serverMicrosoft SharePoint Server 2019Microsoft SharePoint Enterprise Server 2016Microsoft SharePoint Foundation 2013 Service Pack 1
CWE ID-CWE-79
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE-2020-16946
Matching Score-4
Assigner-Microsoft Corporation
ShareView Details
Matching Score-4
Assigner-Microsoft Corporation
CVSS Score-8.7||HIGH
EPSS-1.61% / 73.44%
||
7 Day CHG~0.00%
Published-16 Oct, 2020 | 22:18
Updated-23 Feb, 2026 | 18:21
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
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Action-Not Available
Vendor-Microsoft Corporation
Product-sharepoint_enterprise_serversharepoint_designersharepoint_foundationsharepoint_serverMicrosoft SharePoint Server 2019Microsoft SharePoint Enterprise Server 2016Microsoft SharePoint Foundation 2013 Service Pack 1Microsoft SharePoint Foundation 2010 Service Pack 2
CWE ID-CWE-79
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE-2020-15275
Matching Score-4
Assigner-GitHub, Inc.
ShareView Details
Matching Score-4
Assigner-GitHub, Inc.
CVSS Score-8.7||HIGH
EPSS-1.73% / 75.16%
||
7 Day CHG~0.00%
Published-11 Nov, 2020 | 15:45
Updated-04 Aug, 2024 | 13:15
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
malicious SVG attachment causing stored XSS vulnerability in MoinMoin

MoinMoin is a wiki engine. In MoinMoin before version 1.9.11, an attacker with write permissions can upload an SVG file that contains malicious javascript. This javascript will be executed in a user's browser when the user is viewing that SVG file on the wiki. Users are strongly advised to upgrade to a patched version. MoinMoin Wiki 1.9.11 has the necessary fixes and also contains other important fixes.

Action-Not Available
Vendor-moinmomoinwiki
Product-moinmoinmoin-1.9
CWE ID-CWE-79
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE-2020-15276
Matching Score-4
Assigner-GitHub, Inc.
ShareView Details
Matching Score-4
Assigner-GitHub, Inc.
CVSS Score-7.7||HIGH
EPSS-1.00% / 59.30%
||
7 Day CHG+0.01%
Published-30 Oct, 2020 | 18:55
Updated-04 Aug, 2024 | 13:15
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 in baserCMS

baserCMS before version 4.4.1 is vulnerable to Cross-Site Scripting. Arbitrary JavaScript may be executed by entering a crafted nickname in blog comments. The issue affects the blog comment component. It is fixed in version 4.4.1.

Action-Not Available
Vendor-basercmsbaserproject
Product-basercmsbasercms
CWE ID-CWE-79
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE-2020-13340
Matching Score-4
Assigner-GitLab Inc.
ShareView Details
Matching Score-4
Assigner-GitLab Inc.
CVSS Score-8.7||HIGH
EPSS-68.64% / 99.27%
||
7 Day CHG~0.00%
Published-08 Oct, 2020 | 13:46
Updated-04 Aug, 2024 | 12:18
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

An issue has been discovered in GitLab affecting all versions prior to 13.2.10, 13.3.7 and 13.4.2: Stored XSS in CI Job Log

Action-Not Available
Vendor-GitLab Inc.
Product-gitlabGitLab
CWE ID-CWE-79
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE-2020-11026
Matching Score-4
Assigner-GitHub, Inc.
ShareView Details
Matching Score-4
Assigner-GitHub, Inc.
CVSS Score-8.7||HIGH
EPSS-2.09% / 79.68%
||
7 Day CHG~0.00%
Published-30 Apr, 2020 | 22:15
Updated-04 Aug, 2024 | 11:21
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Specially crafted filenames in WordPress leading to XSS

In affected versions of WordPress, files with a specially crafted name when uploaded to the Media section can lead to script execution upon accessing the file. This requires an authenticated user with privileges to upload files. This has been patched in version 5.4.1, along with all the previously affected versions via a minor release (5.3.3, 5.2.6, 5.1.5, 5.0.9, 4.9.14, 4.8.13, 4.7.17, 4.6.18, 4.5.21, 4.4.22, 4.3.23, 4.2.27, 4.1.30, 4.0.30, 3.9.31, 3.8.33, 3.7.33).

Action-Not Available
Vendor-WordPressDebian GNU/LinuxWordPress.org
Product-wordpressdebian_linuxWordPress
CWE ID-CWE-707
Improper Neutralization
CWE ID-CWE-79
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE-2023-31223
Matching Score-4
Assigner-MITRE Corporation
ShareView Details
Matching Score-4
Assigner-MITRE Corporation
CVSS Score-8.7||HIGH
EPSS-0.51% / 40.43%
||
7 Day CHG~0.00%
Published-25 Apr, 2023 | 00:00
Updated-30 May, 2025 | 16:15
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

Dradis before 4.8.0 allows persistent XSS by authenticated author users, related to avatars.

Action-Not Available
Vendor-dradisframeworkn/a
Product-dradisn/a
CWE ID-CWE-79
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
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