CVE-2026-35544

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.

PUBLISHED Reserved 2026-04-03 | Published 2026-04-03 | Updated 2026-04-03 | Assigner mitre

Problem types

CWE-669 Incorrect Resource Transfer Between Spheres

Product status

References

roundcube.net/...3/18/security-updates-1.7-rc5-1.6.14-1.5.14

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

github.com/...ommit/226811a1c974271dbedca72672923abaff8191c0

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

github.com/...ommit/099009b9c8e1d3c636fb9a5af72f7c2596018662

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

github.com/...ommit/57dec0c127b98e0c8e3b9c26c80049b9c4bcaea7

cve.org (CVE-2026-35544)

nvd.nist.gov (CVE-2026-35544)

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