CVE-2026-35544

5.3 MEDIUM

Published: April 03, 2026 Modified: April 09, 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.

AI Explanation

Get an AI-powered plain-language explanation of this vulnerability and remediation steps.

CVSS v3.x Details

0.0 Low Medium High Critical 10.0

Vector String

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

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory

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

7 reference(s) from NVD

Quick Stats

CVSS v3 Score

5.3 / 10.0

EPSS (Exploit Probability)

0.0%

13th percentile

Exploitation Status

Not in CISA KEV

Weaknesses (CWE)

CWE-669

Affected Vendors

roundcube

Related CVEs