Vulnerability Description
An issue was discovered in Roundcube Webmail before 1.5.14 and 1.6.14. Insufficient Cascading Style Sheets (CSS) sanitization in HTML e-mail messages may lead to a fixed-position mitigation bypass via the use of !important.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Roundcube | Webmail | <= 1.5.13 |
Related Weaknesses (CWE)
References
- https://github.com/roundcube/roundcubemail/commit/099009b9c8e1d3c636fb9a5af72f7cPatch
- https://github.com/roundcube/roundcubemail/commit/226811a1c974271dbedca72672923aPatch
- https://github.com/roundcube/roundcubemail/commit/57dec0c127b98e0c8e3b9c26c80049Patch
- https://github.com/roundcube/roundcubemail/releases/tag/1.5.14Release Notes
- https://github.com/roundcube/roundcubemail/releases/tag/1.6.14Release Notes
- https://github.com/roundcube/roundcubemail/releases/tag/1.7-rc5Release Notes
- https://roundcube.net/news/2026/03/18/security-updates-1.7-rc5-1.6.14-1.5.14Vendor Advisory
FAQ
What is CVE-2026-35544?
CVE-2026-35544 is a vulnerability with a CVSS score of 5.3 (MEDIUM). An issue was discovered in Roundcube Webmail before 1.5.14 and 1.6.14. Insufficient Cascading Style Sheets (CSS) sanitization in HTML e-mail messages may lead to a fixed-position mitigation bypass via...
How severe is CVE-2026-35544?
CVE-2026-35544 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-35544?
Check the references section above for vendor advisories and patch information. Affected products include: Roundcube Webmail.