Improper Handling of Case Sensitivity in Roundcube Webmail - #VU162694
Published: November 9, 2026
Vulnerability identifier: #VU162694
CSH Severity: Low
CVSS v4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-178
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to invoke actions prohibited by the disabled_actions setting.
The vulnerability exists due to inconsistent action-name normalization in Roundcube Webmail's disabled_actions enforcement when evaluating action names containing underscores instead of hyphens. A remote user can replace '-' with '_' in an action name to bypass the restriction and invoke a disabled action.
Affected software
Roundcube Webmail
Remediation
Install security update from vendor's website.
Roundcube Webmail - addressed in versions 1.6.21, 1.7.6