phpList up to .7.0-RC4 Bounce Rule Deletion Endpoint bouncerules.php tk cross-site request forgery

Summaryinfo

A vulnerability classified as problematic was found in phpList up to .7.0-RC4. This affects an unknown function of the file bouncerules.php of the component Bounce Rule Deletion Endpoint. The manipulation of the argument tk results in cross-site request forgery. This vulnerability is known as CVE-2026-73481. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability was found in phpList up to .7.0-RC4. It has been classified as problematic. Affected is an unknown function of the file bouncerules.php of the component Bounce Rule Deletion Endpoint. The manipulation of the argument tk with an unknown input leads to a cross-site request forgery vulnerability. CWE is classifying the issue as CWE-352. The web application does not, or can not, sufficiently verify whether a well-formed, valid, consistent request was intentionally provided by the user who submitted the request. This is going to have an impact on integrity. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-73481 since 08/12/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available.

By approaching the search of inurl:bouncerules.php it is possible to find vulnerable targets with Google Hacking.

Upgrading to version .7.0-RC5 eliminates this vulnerability.

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Productinfo

Type

• Mailing List Software

Name

• phpList

Version

• .7.0-RC4

License

• open-source

CPE 2.3info

• 🔒

CPE 2.2info

• 🔒

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