CVE-2026-35544
MEDIUM5.3EPSS 0.01%Roundcube Webmail: Insufficient CSS sanitization in HTML e-mail messages
Published: 4/3/2026Modified: 4/4/2026
Also known as:GHSA-xpqh-grpw-4xmg
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.
Affected packages (2)
- Debian/roundcubefrom 0, < 1.4.15+dfsg.1-1+deb11u8
- Packagist/roundcube/roundcubemail>= 1.7-beta, < 1.7-rc5
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N |
References (10)
- ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2026-35544
- ADVISORYhttps://security-tracker.debian.org/tracker/CVE-2026-35544
- PATCHhttps://github.com/roundcube/roundcubemail
- WEBhttps://github.com/roundcube/roundcubemail/commit/099009b9c8e1d3c636fb9a5af72f7c2596018662
- WEBhttps://github.com/roundcube/roundcubemail/commit/226811a1c974271dbedca72672923abaff8191c0
- WEBhttps://github.com/roundcube/roundcubemail/commit/57dec0c127b98e0c8e3b9c26c80049b9c4bcaea7
- WEBhttps://github.com/roundcube/roundcubemail/releases/tag/1.5.14
- WEBhttps://github.com/roundcube/roundcubemail/releases/tag/1.6.14
- WEBhttps://github.com/roundcube/roundcubemail/releases/tag/1.7-rc5
- WEBhttps://roundcube.net/news/2026/03/18/security-updates-1.7-rc5-1.6.14-1.5.14