GHSA-xpqh-grpw-4xmgmedium5.3
Roundcube Webmail: Insufficient CSS sanitization in HTML e-mail messages
Impact
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.
Source excerpt · OSVAffected packages
Start with the recorded fix for your release branch. Check your installed version and test compatibility before upgrading. Fixing this advisory does not rule out other vulnerabilities in the release.
roundcube/roundcubemail Packagist
| Affected range | Recorded fix |
|---|---|
| From 1.7-beta before 1.7-rc5Ecosystem versions | 1.7-rc5 |
Version evidence: OSV · GHSA-xpqh-grpw-4xmg
View original version evidence (6 explicit versions)
Original source 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.
References
- Security advisory nvd.nist.gov/vuln/detail/CVE-2026-35544
- Patch github.com/roundcube/roundcubemail/commit/099009b9c8e1d3c636fb9a5af72f7c2596018662
- Patch github.com/roundcube/roundcubemail/commit/226811a1c974271dbedca72672923abaff8191c0
- Patch github.com/roundcube/roundcubemail/commit/57dec0c127b98e0c8e3b9c26c80049b9c4bcaea7
- Source reference github.com/roundcube/roundcubemail
- Release notes github.com/roundcube/roundcubemail/releases/tag/1.5.14
- Release notes github.com/roundcube/roundcubemail/releases/tag/1.6.14
- Release notes github.com/roundcube/roundcubemail/releases/tag/1.7-rc5
- Security advisory roundcube.net/news/2026/03/18/security-updates-1.7-rc5-1.6.14-1.5.14