What’s Vulnerable › Vulnerabilities

CVE-2026-73481: phpList < 3.7.0-RC5 Cross-Site Request Forgery via Bounce Rules

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-13 · updated 2026-09-24
• Weakness: CWE-352

Description

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

• phplist3: before 3.7.0-RC5 — fixed in 3.7.0-RC5

How to fix

Upgrade to a fixed version: phplist3 3.7.0-RC5. Check the vendor advisory for mitigations.

References

• https://github.com/phpList/phplist3/commit/5159c3ed33a5674a8169472b50d146d97f630746
• https://github.com/phpList/phplist3/issues/1116
• https://github.com/phpList/phplist3/pull/1121
• https://github.com/phpList/phplist3/releases/tag/v3.7.0-RC5
• https://www.vulncheck.com/advisories/phplist-rc5-cross-site-request-forgery-via-bounce-rules

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