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.

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Advisories
Source ID Title
Debian DSA Debian DSA DSA-6196-1 roundcube security update
Github GHSA Github GHSA GHSA-vxg2-hhgr-37fx Roundcube Webmail: Insufficient CSS sanitization in HTML e-mail messages
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Sat, 04 Apr 2026 20:00:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 03 Apr 2026 10:15:00 +0000

Type Values Removed Values Added
Title Roundcube Webmail CSS Sanitization Issue Allows SSRF and Information Disclosure

Fri, 03 Apr 2026 05:15:00 +0000

Type Values Removed Values Added
Description 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.
First Time appeared Roundcube
Roundcube webmail
Weaknesses CWE-669
CPEs cpe:2.3:a:roundcube:webmail:*:*:*:*:*:*:*:*
Vendors & Products Roundcube
Roundcube webmail
References
Metrics cvssV3_1

{'score': 5.4, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2026-04-03T12:52:38.240Z

Reserved: 2026-04-03T03:47:51.066Z

Link: CVE-2026-35540

cve-icon Vulnrichment

Updated: 2026-04-03T12:52:34.699Z

cve-icon NVD

Status : Analyzed

Published: 2026-04-03T05:16:22.100

Modified: 2026-04-07T20:52:15.220

Link: CVE-2026-35540

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-04-03T09:15:54Z

Weaknesses