Server-Side Request Forgery (SSRF) in Roundcube Webmail - #VU147193
Published: September 6, 2026
Vulnerability identifier: #VU147193
CSH Severity: Medium
CVSS v4: 4.6 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-918
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 Roundcube CSS proxy when processing hexadecimal IPv6-mapped IPv4 addresses. A remote attacker can supply a hexadecimal IPv6-mapped IPv4 address to perform server-side request forgery.
Affected software
Roundcube Webmail
Remediation
Install security update from vendor's website.
Roundcube Webmail - addressed in versions 1.6.19, 1.7.4