CSS Scoping Bypass in Roundcube Webmail by Roundcube
CVE-2026-114722

6.5MEDIUM

Key Information:

Vendor

Roundcube

Status
Webmail
Vendor
CVE Published:
22 October 2026

What is CVE-2026-114722?

Roundcube Webmail versions prior to 1.6.20 and 1.7.x before 1.7.5 are vulnerable to a CSS scoping bypass in HTML messages. This flaw occurs because the function rcube_utils::mod_css_styles() fails to recognize an at-rule prologue, leading to unscoped selectors that affect the entire Roundcube interface instead of just the message body. Consequently, this allows an attacker to restyle the application's UI, enabling potential spoofing or deceptive representations within the webmail interface.

Affected Version(s)

Webmail 1.6.0 < 1.6.20

Webmail 1.7.0 < 1.7.5

References

https://bugs.debian.org/1151279
issue-trackingthird-party-advisory
https://github.com/roundcube/roundcubemail/commit/95b81ae...
patch
https://roundcube.net/news/2026/10/19/security-updates-1....
vendor-advisoryrelease-notes

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.