CVE-2026-114722CWE-669

CVE-2026-114722

Medium · published October 22, 2026

CVSS v3.1
6.5
EPSS
0%
Percentile
15.8
In the wild
Unconfirmed
What it is

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”.

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00252 · 15.8th percentile
Weakness
CWE-669 · Incorrect Resource Transfer Between Spheres
Published
2026-10-22T06:17Z
References (6)
https://bugs.debian.org/1151279 · [email protected]https://github.com/roundcube/roundcubemail/commit/95b81ae12e2819a9b7e8636b5859b6244cda383e · [email protected]https://github.com/roundcube/roundcubemail/commit/ff9cf4a9bf3b7c66db9afe43fe5f1cc73b47ed35 · [email protected]https://github.com/roundcube/roundcubemail/releases/tag/1.6.20 · [email protected]https://github.com/roundcube/roundcubemail/releases/tag/1.7.5 · [email protected]https://roundcube.net/news/2026/10/19/security-updates-1.6.20-and-1.7.5 · [email protected]
EPSS history
Timeline
  • 23 OCT 03:55Z
    EPSS moved — → 0%
    epss
  • 22 OCT 01:39Z
    Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 is affected by a CSS scoping bypass in HTML messages
    cvelistv5
  • 22 OCT 01:39Z
    Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 is affected by a CSS scoping bypass in HTML messages
    cvelistv5