roundcube/roundcubemail · Security
Roundcube Webmail: Insufficient CSS sanitization in HTML e-mail messages
- GHSA ID
- GHSA-xpqh-grpw-4xmg
- CVE ID
- CVE-2026-35544
- Severity
- medium
- Published
- Updated
- CVSS
- 5.3 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- CVSS v3
- 5.3 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
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.
CWEs
- CWE-669 · Incorrect Resource Transfer Between Spheres
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-35544 ↗
- https://github.com/roundcube/roundcubemail/commit/099009b9c8e1d3c636fb9a5af72f7c2596018662 ↗
- https://github.com/roundcube/roundcubemail/commit/226811a1c974271dbedca72672923abaff8191c0 ↗
- https://github.com/roundcube/roundcubemail/commit/57dec0c127b98e0c8e3b9c26c80049b9c4bcaea7 ↗
- https://github.com/roundcube/roundcubemail/releases/tag/1.5.14 ↗
- https://github.com/roundcube/roundcubemail/releases/tag/1.6.14 ↗
- https://github.com/roundcube/roundcubemail/releases/tag/1.7-rc5 ↗
- https://roundcube.net/news/2026/03/18/security-updates-1.7-rc5-1.6.14-1.5.14 ↗
- https://github.com/advisories/GHSA-xpqh-grpw-4xmg ↗