CVE-2026-73481: Phplist PHPLIST3

Medium severity, CVSS 5.4. EPSS: 0.2% chance of exploitation in the next 30 days.

phpList before 3.7.0-RC5 fail to enforce CSRF token validation on the bounce rule deletion endpoint (bouncerules.php / bouncerule.php). The deletion is performed via a GET request (?page=bouncerules&del=N), and the central CSRF check (verifyCsrfGetToken) is invoked with enforce=false, so it only validates the token when a 'tk' parameter is present. A remote attacker can trick an authenticated administrator into loading a crafted URL (e.g., embedded in an image tag) to delete arbitrary bounce rules from the phplist_bounceregex table without a valid CSRF token.

Affected products

• Phplist PHPLIST3: before 3.7.0-RC5 (fixed in 3.7.0-RC5)

Published 2026-08-13. Last modified 2026-09-24.