VulnerabilityAnalyzed
CVE-2026-35544
Insufficient Cascading Style Sheets (CSS) sanitization in HTML e-mail messages may lead to a fixed-position mitigation bypass via the use of !important.
MEDIUM 5.3EPSS 0.37%
Does this matter?
Lower severity and a low EPSS score (0.37%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 3.1
- 5.3 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- EPSS
- 0.37% probability · 30th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-669
- Affected
- roundcube/webmail
- Source
- cve@mitre.org
References
- https://github.com/roundcube/roundcubemail/commit/099009b9c8e1d3c636fb9a5af72f7c2596018662Patch
- https://github.com/roundcube/roundcubemail/commit/226811a1c974271dbedca72672923abaff8191c0Patch
- https://github.com/roundcube/roundcubemail/commit/57dec0c127b98e0c8e3b9c26c80049b9c4bcaea7Patch
- https://github.com/roundcube/roundcubemail/releases/tag/1.5.14Release Notes
- https://github.com/roundcube/roundcubemail/releases/tag/1.6.14Release Notes
- https://github.com/roundcube/roundcubemail/releases/tag/1.7-rc5Release Notes
- https://roundcube.net/news/2026/03/18/security-updates-1.7-rc5-1.6.14-1.5.14Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.