CVE-2026-114722
Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 is affected by a CSS scoping bypass in HTML messages. rcube_utils::mod_css_styles() did not treat an at-rule prologue such as @layer a; as a sele
Roundcube WebmailApplications & CMS
CVSS
6.5MediumExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.25%Chance of exploitation activity in the next 30 days, higher than 15% of CVEs. Scored 23 Oct 2026FIRST EPSS
What fixes it
A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.
Description
Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 is affected by a CSS scoping bypass in HTML messages. rcube_utils::mod_css_styles() did not treat an at-rule prologue such as @layer a; as a selector boundary, and did not handle selectors beginning with ::, so selectors following an at-rule were left unscoped and applied to the whole Roundcube interface instead of being confined to the message body. This allows an HTML message to restyle application chrome for UI redressing and spoofing. Upstream fixed this in the commit “Fix CSS scoping bypass in HTML messages using at-rules”.
Text from CVE List
Affected versions 2
- Webmailaffected: 1.6.0 before 1.6.20CVE List
- Webmailaffected: 1.7.0 before 1.7.5CVE List
References 6
- github.com/roundcube/roundcubemail/commit/95b81ae12e2819a9b7e8636b5859b6244cda383eFixvia CVE List
- github.com/roundcube/roundcubemail/releases/tag/1.7.5Fixvia CVE List
- github.com/roundcube/roundcubemail/releases/tag/1.6.20Fixvia CVE List
- github.com/roundcube/roundcubemail/commit/ff9cf4a9bf3b7c66db9afe43fe5f1cc73b47ed35Fixvia CVE List
- bugs.debian.org/1151279Advisoryvia CVE List
- roundcube.net/news/2026/10/19/security-updates-1.6.20-and-1.7.5Advisoryvia CVE List