PT-2026-29983 · Roundcube · Webmail

Published 2026-04-03 · Updated 2026-04-03 · CVE-2026-35544

Mitre

CVSS v3.1

5.3

Medium

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

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.

Fix

Weakness Enumeration

CWE-669

Related Identifiers

CVE-2026-35544

Affected Products

Webmail

References · 8

• https://nvd.nist.gov/vuln/detail/CVE-2026-35544 · Security Note
• https://github.com/roundcube/roundcubemail/releases/tag/1.7-rc5 · Note
• https://github.com/roundcube/roundcubemail/releases/tag/1.5.14 · Note
• https://github.com/roundcube/roundcubemail/commit/226811a1c974271dbedca72672923abaff8191c0 · Note
• https://github.com/roundcube/roundcubemail/commit/099009b9c8e1d3c636fb9a5af72f7c2596018662 · Note
• https://github.com/roundcube/roundcubemail/commit/57dec0c127b98e0c8e3b9c26c80049b9c4bcaea7 · Note
• https://github.com/roundcube/roundcubemail/releases/tag/1.6.14 · Note
• https://roundcube.net/news/2026/03/18/security-updates-1.7-rc5-1.6.14-1.5.14 · Note