GitHub Advisoryadvisory · Packagist
GHSA-xpqh-grpw-4xmg Roundcube Webmail: Insufficient CSS sanitization in HTML e-mail messages
MEDIUM
Official page ↗
- Aliases
- CVE-2026-35544
- Ecosystem
- Packagist
- Packages
- roundcube/roundcubemail
- Severity
- Moderate
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- Weaknesses
- CWE-669
- Reviewed
- 2026-04-04
Affected packages
• Packagist roundcube/roundcubemail: >= 1.7-beta, < 1.7-rc5 → fixed in 1.7-rc5
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.
Related
Alias · CVE (1)
- CVE-2026-35544 An issue was discovered in Roundcube Webmail before 1.5.14 and 1.6.14. vulnerability
Weakness · CWE (1)
- CWE-669 Incorrect Resource Transfer Between Spheres weakness
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-35544 advisory
- https://github.com/roundcube/roundcubemail/commit/099009b9c8e1d3c636fb9a5af72f7c2596018662 web
- https://github.com/roundcube/roundcubemail/commit/226811a1c974271dbedca72672923abaff8191c0 web
- https://github.com/roundcube/roundcubemail/commit/57dec0c127b98e0c8e3b9c26c80049b9c4bcaea7 web
- https://github.com/roundcube/roundcubemail package
- https://github.com/roundcube/roundcubemail/releases/tag/1.5.14 web
- https://github.com/roundcube/roundcubemail/releases/tag/1.6.14 web
- https://github.com/roundcube/roundcubemail/releases/tag/1.7-rc5 web
- https://roundcube.net/news/2026/03/18/security-updates-1.7-rc5-1.6.14-1.5.14 web