CVE-2026-35540

medium

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.

References

https://roundcube.net/news/2026/03/18/security-updates-1.7-rc5-1.6.14-1.5.14

https://github.com/roundcube/roundcubemail/releases/tag/1.7-rc5

https://github.com/roundcube/roundcubemail/releases/tag/1.6.14

https://github.com/roundcube/roundcubemail/commit/579b68eff90650a5c782e153debd66c765648942

https://github.com/roundcube/roundcubemail/commit/27ec6cc9cb25e1ef8b4d4ef39ce76d619caa6870

Details

Source: Mitre, NVD

Published: 2026-04-03

Updated: 2026-04-03

Risk Information

CVSS v2

Base Score: 4

Vector: CVSS2#AV:N/AC:H/Au:N/C:P/I:P/A:N

Severity: Medium

CVSS v3

Base Score: 5.4

Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N