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Vulnerability Details :

CVE-2026-48843

Summary
Assigner-mitre
Assigner Org ID-8254265b-2729-46b6-b9e3-3dfca2d5bfca
Published At-25 May, 2026 | 19:11
Updated At-26 May, 2026 | 12:50
Rejected At-
Credits

Roundcube Webmail 1.6.x between 1.6.14 and 1.6.16,and 1.7.x before 1.7.1 has Insufficient Cascading Style Sheets (CSS) sanitization in HTML e-mail messages may lead to SSRF or Information Disclosure, e.g., if stylesheet links point to local network hosts. The issue stems from an insufficient fix for CVE-2026-35540.

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:mitre
Assigner Org ID:8254265b-2729-46b6-b9e3-3dfca2d5bfca
Published At:25 May, 2026 | 19:11
Updated At:26 May, 2026 | 12:50
Rejected At:
â–¼CVE Numbering Authority (CNA)

Roundcube Webmail 1.6.x between 1.6.14 and 1.6.16,and 1.7.x before 1.7.1 has Insufficient Cascading Style Sheets (CSS) sanitization in HTML e-mail messages may lead to SSRF or Information Disclosure, e.g., if stylesheet links point to local network hosts. The issue stems from an insufficient fix for CVE-2026-35540.

Affected Products
Vendor
Roundcube Webmail ProjectRoundcube
Product
Webmail
Default Status
unaffected
Versions
Affected
  • From 1.6.14 before 1.6.16 (semver)
  • From 1.7.0 before 1.7.1 (semver)
Problem Types
TypeCWE IDDescription
CWECWE-918CWE-918 Server-Side Request Forgery (SSRF)
Type: CWE
CWE ID: CWE-918
Description: CWE-918 Server-Side Request Forgery (SSRF)
Metrics
VersionBase scoreBase severityVector
3.17.2HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Version: 3.1
Base score: 7.2
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://roundcube.net/news/2026/05/24/security-updates-1.6.16-and-1.7.1
N/A
https://github.com/roundcube/roundcubemail/releases/tag/1.7.1
N/A
https://github.com/roundcube/roundcubemail/commit/ab96c88bfd888866ec5e02190b19618db283923a
N/A
https://github.com/roundcube/roundcubemail/releases/tag/1.6.16
N/A
https://github.com/roundcube/roundcubemail/commit/cb3fc9041e91640ba9ba49ee7b2147c176ebf5a1
N/A
Hyperlink: https://roundcube.net/news/2026/05/24/security-updates-1.6.16-and-1.7.1
Resource: N/A
Hyperlink: https://github.com/roundcube/roundcubemail/releases/tag/1.7.1
Resource: N/A
Hyperlink: https://github.com/roundcube/roundcubemail/commit/ab96c88bfd888866ec5e02190b19618db283923a
Resource: N/A
Hyperlink: https://github.com/roundcube/roundcubemail/releases/tag/1.6.16
Resource: N/A
Hyperlink: https://github.com/roundcube/roundcubemail/commit/cb3fc9041e91640ba9ba49ee7b2147c176ebf5a1
Resource: N/A
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
Information is not available yet
â–¼National Vulnerability Database (NVD)
nvd.nist.gov
Source:cve@mitre.org
Published At:25 May, 2026 | 20:16
Updated At:25 May, 2026 | 20:16

Roundcube Webmail 1.6.x between 1.6.14 and 1.6.16,and 1.7.x before 1.7.1 has Insufficient Cascading Style Sheets (CSS) sanitization in HTML e-mail messages may lead to SSRF or Information Disclosure, e.g., if stylesheet links point to local network hosts. The issue stems from an insufficient fix for CVE-2026-35540.

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
Secondary3.17.2HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Type: Secondary
Version: 3.1
Base score: 7.2
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
CPE Matches
Weaknesses
CWE IDTypeSource
CWE-918Primarycve@mitre.org
CWE ID: CWE-918
Type: Primary
Source: cve@mitre.org
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://github.com/roundcube/roundcubemail/commit/ab96c88bfd888866ec5e02190b19618db283923acve@mitre.org
N/A
https://github.com/roundcube/roundcubemail/commit/cb3fc9041e91640ba9ba49ee7b2147c176ebf5a1cve@mitre.org
N/A
https://github.com/roundcube/roundcubemail/releases/tag/1.6.16cve@mitre.org
N/A
https://github.com/roundcube/roundcubemail/releases/tag/1.7.1cve@mitre.org
N/A
https://roundcube.net/news/2026/05/24/security-updates-1.6.16-and-1.7.1cve@mitre.org
N/A
Hyperlink: https://github.com/roundcube/roundcubemail/commit/ab96c88bfd888866ec5e02190b19618db283923a
Source: cve@mitre.org
Resource: N/A
Hyperlink: https://github.com/roundcube/roundcubemail/commit/cb3fc9041e91640ba9ba49ee7b2147c176ebf5a1
Source: cve@mitre.org
Resource: N/A
Hyperlink: https://github.com/roundcube/roundcubemail/releases/tag/1.6.16
Source: cve@mitre.org
Resource: N/A
Hyperlink: https://github.com/roundcube/roundcubemail/releases/tag/1.7.1
Source: cve@mitre.org
Resource: N/A
Hyperlink: https://roundcube.net/news/2026/05/24/security-updates-1.6.16-and-1.7.1
Source: cve@mitre.org
Resource: N/A

Change History

0
Information is not available yet

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