| Name | CVE-2026-35544 |
| 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. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DLA-4517-1, DSA-6196-1 |
| Debian Bugs | 1131182 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| roundcube (PTS) | bullseye | 1.4.15+dfsg.1-1+deb11u4 | vulnerable |
| bullseye (security) | 1.4.15+dfsg.1-1+deb11u8 | fixed | |
| bookworm | 1.6.5+dfsg-1+deb12u6 | vulnerable | |
| bookworm (security) | 1.6.5+dfsg-1+deb12u8 | fixed | |
| trixie | 1.6.13+dfsg-0+deb13u1 | vulnerable | |
| trixie (security) | 1.6.15+dfsg-0+deb13u1 | fixed | |
| forky, sid | 1.6.15+dfsg-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| roundcube | source | bullseye | 1.4.15+dfsg.1-1+deb11u8 | DLA-4517-1 | ||
| roundcube | source | bookworm | 1.6.5+dfsg-1+deb12u8 | DSA-6196-1 | ||
| roundcube | source | trixie | 1.6.15+dfsg-0+deb13u1 | DSA-6196-1 | ||
| roundcube | source | (unstable) | 1.6.14+dfsg-1 | 1131182 |
https://roundcube.net/news/2026/03/18/security-updates-1.7-rc5-1.6.14-1.5.14
https://nullcathedral.com/posts/2026-03-18-roundcube-round-two-three-more-sanitizer-bypasses/#css-position-fixed-important
Fixed by: https://github.com/roundcube/roundcubemail/commit/226811a1c974271dbedca72672923abaff8191c0 (1.7-rc5)
Fixed by: https://github.com/roundcube/roundcubemail/commit/099009b9c8e1d3c636fb9a5af72f7c2596018662 (1.6.14)
fixed by: https://github.com/roundcube/roundcubemail/commit/57dec0c127b98e0c8e3b9c26c80049b9c4bcaea7 (1.5.14)