CVE-2026-35544
Fixed in a distro release EPSS <1%CVSS 5.3
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.
Products: roundcube webmail
Fixed upstream
| Ecosystem | Package | Fixed in |
|---|---|---|
| Packagist | roundcube/roundcubemail | 1.7-rc5 |
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Debian 12 | roundcube | 1.6.5+dfsg-1+deb12u8 |
| Debian 13 | roundcube | 1.6.15+dfsg-0+deb13u1 |
| Debian 14 | roundcube | 1.6.14+dfsg-1 |
| Ubuntu 25.10 | roundcube | no fix |
| Ubuntu 26.10 | roundcube | no fix |
| Ubuntu Pro 16.04 LTS | roundcube | no fix |
| Ubuntu Pro 18.04 LTS | roundcube | no fix |
| Ubuntu Pro 20.04 LTS | roundcube | no fix |
| Ubuntu Pro 22.04 LTS | roundcube | no fix |
| Ubuntu Pro 24.04 LTS | roundcube | no fix |
| Ubuntu Pro 26.04 LTS | roundcube | no fix |