Improper access control in Roundcube Webmail - #VU136902
Published: July 5, 2026
Vulnerability identifier: #VU136902
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: N/A
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Roundcube
Affected software:
Roundcube Webmail
Roundcube Webmail
Detailed vulnerability description
The vulnerability allows a remote user to escalate privileges.
The vulnerability exists due to improper access control in the password plugin when using a session-injected username. A remote user can inject a username into the session to escalate privileges.
Remediation
Install security update from vendor's website.