What’s Vulnerable › Vulnerabilities
CVE-2026-53640: FOSSBilling missing authorization checks on read-only admin API endpoints expose sensitive staff, client, and redirect data
- Severity: low (CVSS 2.3 v4.0)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.4% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-07-06 · updated 2026-07-07
- Weakness: CWE-200
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.
Affected products
- FOSSBilling: before 0.8.0
References
Get alerted when CVE-2026-53640 or the next vulnerability affects your stack