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 products
roundcube: webmail
References5
- roundcube.net/news/2026/03/18/security-updates-1.7-rc5-1.6.14-1… Vendor Advisory
- github.com/roundcube/roundcubemail/commit/27ec6cc9cb25e1ef8b4d4… Patch
- github.com/roundcube/roundcubemail/commit/579b68eff90650a5c782e… Patch
- github.com/roundcube/roundcubemail/releases/tag/1.6.14 Release Notes
- github.com/roundcube/roundcubemail/releases/tag/1.7-rc5 Release Notes
Metrics
- CVSS 3.1
-
6.5
MEDIUM
Score source: NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N - EPSS — exploit probability
- 0% percentile: 35 · as of 12 November 2026
- CWE
- CWE-669
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.