What’s Vulnerable › Vulnerabilities

CVE-2026-35544

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-03 · updated 2026-07-24
• Weakness: CWE-669

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 products

• Roundcube Webmail: through 1.5.13; from 1.6.0 through 1.6.13

References

• https://github.com/roundcube/roundcubemail/commit/099009b9c8e1d3c636fb9a5af72f7c2596018662
• https://github.com/roundcube/roundcubemail/commit/226811a1c974271dbedca72672923abaff8191c0
• https://github.com/roundcube/roundcubemail/commit/57dec0c127b98e0c8e3b9c26c80049b9c4bcaea7
• https://github.com/roundcube/roundcubemail/releases/tag/1.5.14
• https://github.com/roundcube/roundcubemail/releases/tag/1.6.14
• https://github.com/roundcube/roundcubemail/releases/tag/1.7-rc5
• https://roundcube.net/news/2026/03/18/security-updates-1.7-rc5-1.6.14-1.5.14

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