Input validation error in Roundcube Webmail - #VU141370
Published: August 9, 2026
Vulnerability identifier: #VU141370
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/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 perform server-side request forgery.
The vulnerability exists due to improper input validation in the is_local_url() check when handling nip.io and sslip.io hostnames. A remote attacker can use crafted hostname forms to perform server-side request forgery.
Affected software
Roundcube Webmail
Remediation
Install security update from vendor's website.
Roundcube Webmail - addressed in versions 1.6.18, 1.7.3