CVE-2026-53643 FOSSBilling allows low-privileged staff accounts to perform unauthorized actions via admin API endpoints
Low-privileged staff can perform unauthorized actions and access sensitive data via admin API endpoints due to insufficient permission checks.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-53643?
CVE-2026-53643 is a high-severity missing authorization vulnerability in FOSSBilling, published on 6 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
FOSSBilling is a free, open-source billing and client management system. Versions prior to 0.8.0 allow low-privileged staff accounts to perform unauthorized actions via admin API endpoints. The root cause is a combination of the `can_always_access` module flag (which grants all staff access to certain modules) and insufficient permission checks or unsafe parameter handling on individual endpoints. Version 0.8.0 contains a fix. Some workarounds are available. Restrict staff accounts to only those who need access to sensitive settings and/or use a reverse proxy or WAF to restrict access to the affected endpoints to trusted IP addresses or higher-privilege roles.
Which versions are affected by CVE-2026-53643?
How do I fix CVE-2026-53643?
No fix has been published for CVE-2026-53643 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-53643 being exploited?
There is no known exploitation of CVE-2026-53643 in the wild and no public exploit code.
Sources
Also known as GHSA-563q-g4r4-6f9m.