Open redirect in Roundcube Webmail - #VU162683
Published: November 9, 2026
Vulnerability identifier: #VU162683
CSH Severity: Medium
CVSS v4: 5.1 [CVSS:4.0/AV:N/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-601
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to redirect a browser to an untrusted destination.
The vulnerability exists due to insufficient validation of redirect destinations in Roundcube Webmail's attachment retrieval error recovery when handling an IMAP error. A remote attacker can exploit the error recovery redirect to direct a browser to an attacker-controlled destination.
Affected software
Roundcube Webmail
Remediation
Install security update from vendor's website.
Roundcube Webmail - addressed in versions 1.6.21, 1.7.6