CVE-2026-35540

MEDIUM

Roundcube Webmail < 1.6.14 - Information Disclosure

Title source: rule

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 (5)

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/commit/579b68eff90650a5c782e153debd66c765648942

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

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

View Patch ZIP pw:eip

Scores

CVSS v3 5.4

EPSS 0.0005

EPSS Percentile 14.4%

Attack Vector NETWORK

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

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-669

Status published

Products (3)

roundcube/roundcubemail 1.7-beta - 1.7-rc5Packagist

Roundcube/Webmail 1.6.0 - 1.6.14

roundcube/webmail 1.6.0 - 1.6.14

Published Apr 03, 2026

Tracked Since Apr 03, 2026