Input validation error in Roundcube Webmail - #VU147190
Published: September 6, 2026
Vulnerability identifier: #VU147190
CSH Severity: Low
CVSS v4: 4.6 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to bypass stylesheet URL validation.
The vulnerability exists due to improper input validation in is_local_url() when validating a stylesheet URL with a trailing-dot fully qualified domain name. A remote attacker can supply a stylesheet URL containing a trailing-dot fully qualified domain name to bypass stylesheet URL validation.
Affected software
Roundcube Webmail
Remediation
Install security update from vendor's website.
Roundcube Webmail - addressed in versions 1.6.19, 1.7.4