CVE-2026-43920
Description
FOSSBilling is a free, open-source billing and client management system. In versions 0.5.4 through 0.7.2, the /run-patcher maintenance endpoint in FOSSBilling was accessible without authentication, which allowed unauthenticated remote users to trigger update patch routines that modify configuration files, execute database schema changes, perform filesystem mutations, and clear caches. The /run-patcher endpoint executes privileged maintenance operations - configuration migrations, database patch execution (including ALTER TABLE, DROP TABLE, UPDATE statements), filesystem deletions and renames, and cache clearing - without requiring administrator authentication, CSRF validation, or CLI context. An unauthenticated remote attacker can trigger these operations by sending a simple HTTP GET request to /run-patcher, which can be abused for denial-of-service attacks. Certain patches (e.g., batch token regeneration for all admin and client accounts in patch 53, and session invalidation) are disruptive even when re-executed against an already-patched instance. Repeated or concurrent requests may also cause inconsistent database state. This issue has been fixed in version 0.8.0.
Summary dbcve.org
FOSSBilling versions 0.5.4-0.7.2 contain an unauthenticated command injection vulnerability in the /run-patcher maintenance endpoint. This endpoint executes privileged operations including database schema changes (ALTER TABLE, DROP TABLE, UPDATE), configuration file modifications, filesystem mutations, cache clearing, and batch token regeneration without requiring authentication, CSRF validation, or CLI context. An attacker can trigger these destructive operations via a simple HTTP GET request.
Mitigation
Upgrade FOSSBilling to version 0.8.0 or later. If immediate upgrade is not feasible, disable or restrict access to the /run-patcher endpoint at the web server level until the upgrade can be applied.