CVE-2026-35540
MEDIUM5.4EPSS 0.02%Roundcube Webmail: Insufficient CSS sanitization in HTML e-mail messages
Published: 4/3/2026Modified: 4/4/2026
Also known as:GHSA-vxg2-hhgr-37fx
Description
An issue was discovered in Roundcube Webmail 1.6.0 before 1.6.14. Insufficient Cascading Style Sheets (CSS) sanitization in HTML e-mail messages may lead to SSRF or Information Disclosure, e.g., if stylesheet links point to local network hosts.
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 | MEDIUM5.4 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N |
References (8)
- ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2026-35540
- ADVISORYhttps://security-tracker.debian.org/tracker/CVE-2026-35540
- PATCHhttps://github.com/roundcube/roundcubemail
- WEBhttps://github.com/roundcube/roundcubemail/commit/27ec6cc9cb25e1ef8b4d4ef39ce76d619caa6870
- WEBhttps://github.com/roundcube/roundcubemail/commit/579b68eff90650a5c782e153debd66c765648942
- 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