roundcube/roundcubemail · Security
Roundcube Webmail: Insufficient CSS sanitization in HTML e-mail messages
- GHSA ID
- GHSA-vxg2-hhgr-37fx
- CVE ID
- CVE-2026-35540
- Severity
- medium
- Published
- Updated
- CVSS
- 5.4 · CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N
- CVSS v3
- 5.4 · CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N
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.
CWEs
- CWE-669 · Incorrect Resource Transfer Between Spheres
- CWE-918 · Server-Side Request Forgery (SSRF)
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-35540 ↗
- https://github.com/roundcube/roundcubemail/commit/27ec6cc9cb25e1ef8b4d4ef39ce76d619caa6870 ↗
- https://github.com/roundcube/roundcubemail/commit/579b68eff90650a5c782e153debd66c765648942 ↗
- 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-vxg2-hhgr-37fx ↗