CVE-2026-35544

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CVSS 3.1

5.3 medium

EPSS

<1%p30

Published

Apr 3, 2026 (Apr 3, 2026)

Modified

Jul 24, 2026

Description

An issue was discovered in Roundcube Webmail before 1.5.14 and 1.6.14. Insufficient Cascading Style Sheets (CSS) sanitization in HTML e-mail messages may lead to a fixed-position mitigation bypass via the use of !important.

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

NVD CVE.org GitHub PoCs EPSS (0.4%)

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