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Vulnerability Details :

CVE-2026-35540

Summary
Assigner-mitre
Assigner Org ID-8254265b-2729-46b6-b9e3-3dfca2d5bfca
Published At-03 Apr, 2026 | 03:47
Updated At-03 Apr, 2026 | 12:52
Rejected At-
Credits

An issue was discovered in Roundcube Webmail 1.6.0 before 1.6.14. 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.

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:03 Apr, 2026 | 03:47
Updated At:03 Apr, 2026 | 12:52
Rejected At:
▼CVE Numbering Authority (CNA)

An issue was discovered in Roundcube Webmail 1.6.0 before 1.6.14. 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.

Affected Products
Vendor
Roundcube Webmail ProjectRoundcube
Product
Webmail
Default Status
unaffected
Versions
Affected
  • From 1.6.0 before 1.6.14 (semver)
Problem Types
TypeCWE IDDescription
CWECWE-669CWE-669 Incorrect Resource Transfer Between Spheres
Type: CWE
CWE ID: CWE-669
Description: CWE-669 Incorrect Resource Transfer Between Spheres
Metrics
VersionBase scoreBase severityVector
3.15.4MEDIUM
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N
Version: 3.1
Base score: 5.4
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:N/AC:H/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/2026/03/18/security-updates-1.7-rc5-1.6.14-1.5.14
N/A
https://github.com/roundcube/roundcubemail/releases/tag/1.7-rc5
N/A
https://github.com/roundcube/roundcubemail/commit/579b68eff90650a5c782e153debd66c765648942
N/A
https://github.com/roundcube/roundcubemail/releases/tag/1.6.14
N/A
https://github.com/roundcube/roundcubemail/commit/27ec6cc9cb25e1ef8b4d4ef39ce76d619caa6870
N/A
Hyperlink: https://roundcube.net/news/2026/03/18/security-updates-1.7-rc5-1.6.14-1.5.14
Resource: N/A
Hyperlink: https://github.com/roundcube/roundcubemail/releases/tag/1.7-rc5
Resource: N/A
Hyperlink: https://github.com/roundcube/roundcubemail/commit/579b68eff90650a5c782e153debd66c765648942
Resource: N/A
Hyperlink: https://github.com/roundcube/roundcubemail/releases/tag/1.6.14
Resource: N/A
Hyperlink: https://github.com/roundcube/roundcubemail/commit/27ec6cc9cb25e1ef8b4d4ef39ce76d619caa6870
Resource: N/A
▼Authorized 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
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:cve@mitre.org
Published At:03 Apr, 2026 | 05:16
Updated At:07 Apr, 2026 | 20:52

An issue was discovered in Roundcube Webmail 1.6.0 before 1.6.14. 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.

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
Secondary3.15.4MEDIUM
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N
Primary3.16.5MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Type: Secondary
Version: 3.1
Base score: 5.4
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N
Type: Primary
Version: 3.1
Base score: 6.5
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
CPE Matches
Roundcube Webmail Project
roundcube
>>webmail>>Versions from 1.6.0(inclusive) to 1.6.14(exclusive)
cpe:2.3:a:roundcube:webmail:*:*:*:*:*:*:*:*
Weaknesses
CWE IDTypeSource
CWE-669Primarycve@mitre.org
CWE ID: CWE-669
Type: Primary
Source: cve@mitre.org
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://github.com/roundcube/roundcubemail/commit/27ec6cc9cb25e1ef8b4d4ef39ce76d619caa6870cve@mitre.org
Patch
https://github.com/roundcube/roundcubemail/commit/579b68eff90650a5c782e153debd66c765648942cve@mitre.org
Patch
https://github.com/roundcube/roundcubemail/releases/tag/1.6.14cve@mitre.org
Release Notes
https://github.com/roundcube/roundcubemail/releases/tag/1.7-rc5cve@mitre.org
Release Notes
https://roundcube.net/news/2026/03/18/security-updates-1.7-rc5-1.6.14-1.5.14cve@mitre.org
Vendor Advisory
Hyperlink: https://github.com/roundcube/roundcubemail/commit/27ec6cc9cb25e1ef8b4d4ef39ce76d619caa6870
Source: cve@mitre.org
Resource:
Patch
Hyperlink: https://github.com/roundcube/roundcubemail/commit/579b68eff90650a5c782e153debd66c765648942
Source: cve@mitre.org
Resource:
Patch
Hyperlink: https://github.com/roundcube/roundcubemail/releases/tag/1.6.14
Source: cve@mitre.org
Resource:
Release Notes
Hyperlink: https://github.com/roundcube/roundcubemail/releases/tag/1.7-rc5
Source: cve@mitre.org
Resource:
Release Notes
Hyperlink: https://roundcube.net/news/2026/03/18/security-updates-1.7-rc5-1.6.14-1.5.14
Source: cve@mitre.org
Resource:
Vendor Advisory

Change History

0
Information is not available yet

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CVE-2026-35544
Matching Score-6
Assigner-MITRE Corporation
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EPSS-0.04% / 13.04%
||
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