CVE-2026-43920— FOSSBilling: Unauthenticated update patcher endpoint allows remote maintenance execution

FOSSBilling: Unauthenticated update patcher endpoint allows remote maintenance execution

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.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N

关键功能的认证机制缺失

FOSSBilling 授权问题漏洞

fossbilling是fossbilling团队开源的一种高效计费和客户管理方案。 FOSSBilling 0.5.4版本至0.7.2版本存在授权问题漏洞，该漏洞源于/run-patcher维护端点无需身份验证即可访问，可能导致未经远程身份验证的攻击者通过发送HTTP GET请求触发修改配置文件、执行数据库架构更改、执行文件系统操作和清除缓存等特权维护操作，从而容易受到拒绝服务攻击。

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