CVE-2021-3639
mod_auth_mellon: Open Redirect vulnerability in logout URLs
Severity
ModerateRed Hat Product Security
CVSS 3.0
Review impact separately from score.
Published · July 29, 2021
Updated · November 22, 2025
Description
A flaw was found in mod_auth_mellon where it does not sanitize logout URLs properly. This issue could be used by an attacker to facilitate phishing attacks by tricking users into visiting a trusted web application URL that redirects to an external and potentially malicious server. The highest threat from this liability is to confidentiality and integrity.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.0 · 6.1CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CWE-601 · URL Redirection to Untrusted Site ('Open Redirect')