CVE-2026-35544

Published: Apr 3, 2026Modified: Jul 24, 2026

5.3

Vector

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

Exploitability: 3.9 / Impact: 1.4

Source: MITRE (Secondary)

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.

Affected (2)

Products: Roundcube: Webmail

Roundcube

1 product

Webmail

Configuration A

2 vulnerable

Vulnerable Software	Affected Versions
Roundcube Webmail	Up to 1.5.13
Roundcube Webmail	From 1.6.0 to 1.6.13

Related CWEs

CWE-669

Incorrect Resource Transfer Between Spheres

The product does not properly transfer a resource/behavior to another sphere, or improperly imports a resource/behavior from another sphere, in a manner that provides unintended control over that resource.

References (7)

https://github.com/roundcube/roundcubemail/commit/099009b9c8e1d3c636fb9a5af72f7c2596018662

Source: cve@mitre.org

Patch

https://github.com/roundcube/roundcubemail/commit/226811a1c974271dbedca72672923abaff8191c0

Source: cve@mitre.org

Patch

https://github.com/roundcube/roundcubemail/commit/57dec0c127b98e0c8e3b9c26c80049b9c4bcaea7

Source: cve@mitre.org

Patch

https://github.com/roundcube/roundcubemail/releases/tag/1.5.14

Source: cve@mitre.org

Release Notes

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

Source: cve@mitre.org

Release Notes

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

Source: cve@mitre.org

Release Notes

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

Source: cve@mitre.org

Vendor Advisory

Timeline

No history available yet.