CVE-2026-35540

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CVSS 3.1

6.5 medium

EPSS

<1%p32

Published

Apr 3, 2026 (Apr 3, 2026)

Modified

Jul 24, 2026

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.

Vendors: roundcube
Products: webmail
Weakness: CWE-669
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

NVD CVE.org GitHub PoCs EPSS (0.4%)

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