CVE-2026-53640 Missing authorization in FOSSBilling
Low-privileged staff can access sensitive data via unprotected read-only admin API endpoints in FOSSBilling.
- 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-2026-53640?
CVE-2026-53640 is a low-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. Prior to version 0.8.0, low-privileged staff accounts may read sensitive data via admin API endpoints that lack permission checks. While sibling write endpoints correctly enforce fine-grained permissions, the corresponding read endpoints have no authorization guards. Version 0.8.0 contains a fix. Some workarounds are available. Restrict staff accounts to only those who need access to sensitive data and/or use a reverse proxy or WAF to restrict access to the affected endpoints.
Which versions are affected by CVE-2026-53640?
How do I fix CVE-2026-53640?
No fix has been published for CVE-2026-53640 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-2026-53640 being exploited?
There is no known exploitation of CVE-2026-53640 in the wild and no public exploit code.
Sources
Also known as GHSA-jqw4-3hj3-8m4f.