CVE-2026-74998
Fixed in a distro release EPSS <1%CVSS 7.2
In Roundcube Webmail before 1.6.18 and 1.7.x before 1.7.3, responses from the CSS (Cascading Style Sheets) proxy were not validated, which may result in information disclosure or XSS (cross-site scripting) via MIME sniffing.
Products: roundcube webmail
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Debian 12 | roundcube | 1.6.5+dfsg-1+deb12u11 |
| Debian 13 | roundcube | 1.6.18+dfsg-0+deb13u1 |
| Debian 14 | roundcube | 1.6.18+dfsg-1 |
| 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 |
| openSUSE Tumbleweed | roundcubemail | 1.6.19-1.1 |