Improper access control in Roundcube Webmail - #VU141373
Published: August 9, 2026
Vulnerability identifier: #VU141373
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-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to inject arbitrary Sieve scripts.
The vulnerability exists due to improper access control in filter rule name handling when enforcing managesieve_disabled_actions. A remote user can use a crafted filter rule name to inject arbitrary Sieve scripts.
Affected software
Roundcube Webmail
Remediation
Install security update from vendor's website.
Roundcube Webmail - addressed in versions 1.6.18, 1.7.3