CVE-2026-53647
FOSSBilling vulnerable to unauthenticated API key configuration disclosure via guest Serviceapikey get_info endpoint
FOSSBilling is a free, open-source billing and client management system. In versions 0.5.3 through 0.7.2, the Guest serviceapikey/get_info API endpoint is accessible without authentication. Any caller with a valid API key can retrieve all custom configuration parameters (custom_* fields) stored in the key's database record. These custom fields are populated by billing administrators and can contain business-sensitive data such as pricing tiers, feature flags, rate limits, expiry overrides, or access scope data. Version 0.8.0 patches the issue. Some workarounds are available. Administrators can avoid storing sensitive data in custom_* API key configuration fields, monitor API logs for suspicious calls to /api/guest/serviceapikey/get_info, and/or disable the Serviceapikey module if not in active use.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- Low
- Integrity
- None
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
FOSSBilling vulnerable to unauthenticated API key configuration disclosure via guest Serviceapikey get_info endpoint
FOSSBilling is a free, open-source billing and client management system. In versions 0.5.3 through 0.7.2, the Guest serviceapikey/get_info API endpoint is accessible without authentication. Any caller with a valid API key can retrieve all custom configuration parameters (custom_* fields) stored in the key's database record. These custom fields are populated by billing administrators and can contain business-sensitive data such as pricing tiers, feature flags, rate limits, expiry overrides, or access scope data. Version 0.8.0 patches the issue. Some workarounds are available. Administrators can avoid storing sensitive data in custom_* API key configuration fields, monitor API logs for suspicious calls to /api/guest/serviceapikey/get_info, and/or disable the Serviceapikey module if not in active use.
- Record
CVE-2026-53647- CVSS 4.0
- 6.9 Medium
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N - Weakness
- CWE-200, CWE-306, CWE-862
- Updated
- 2026-11-02
EUVDEUVD-2026-41973
FOSSBilling is a free, open-source billing and client management system. In versions 0.5.3 through 0.7.2, the Guest serviceapikey/get_info API endpoint is accessible without authentication. Any caller with a valid API key can retrieve all custom configuration parameters (custom_* fields) stored in the key's database record. These custom fields are populated by billing administrators and can contain business-sensitive data such as pricing tiers, feature flags, rate limits, expiry overrides, or access scope data. Version 0.8.0 patches the issue. Some workarounds are available. Administrators can avoid storing sensitive data in custom_* API key configuration fields, monitor API logs for suspicious calls to /api/guest/serviceapikey/get_info, and/or disable the Serviceapikey module if not in active use.
- Record
EUVD-2026-41973- CVSS 4.0
- 6.9 Medium
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N - Updated
- 2026-11-02
NVD
FOSSBilling is a free, open-source billing and client management system. In versions 0.5.3 through 0.7.2, the Guest serviceapikey/get_info API endpoint is accessible without authentication. Any caller with a valid API key can retrieve all custom configuration parameters (custom_* fields) stored in the key's database record. These custom fields are populated by billing administrators and can contain business-sensitive data such as pricing tiers, feature flags, rate limits, expiry overrides, or access scope data. Version 0.8.0 patches the issue. Some workarounds are available. Administrators can avoid storing sensitive data in custom_* API key configuration fields, monitor API logs for suspicious calls to /api/guest/serviceapikey/get_info, and/or disable the Serviceapikey module if not in active use.
- Record
CVE-2026-53647- CVSS 4.0
- 6.9 Medium
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - Weakness
- CWE-200, CWE-306, CWE-862
- Updated
- 2026-11-02
OSV
FOSSBilling vulnerable to unauthenticated API key configuration disclosure via guest Serviceapikey get_info endpoint
FOSSBilling is a free, open-source billing and client management system. In versions 0.5.3 through 0.7.2, the Guest serviceapikey/get_info API endpoint is accessible without authentication. Any caller with a valid API key can retrieve all custom configuration parameters (custom_* fields) stored in the key's database record. These custom fields are populated by billing administrators and can contain business-sensitive data such as pricing tiers, feature flags, rate limits, expiry overrides, or access scope data. Version 0.8.0 patches the issue. Some workarounds are available. Administrators can avoid storing sensitive data in custom_* API key configuration fields, monitor API logs for suspicious calls to /api/guest/serviceapikey/get_info, and/or disable the Serviceapikey module if not in active use.
- Record
CVE-2026-53647- CVSS 4.0
- 6.9 Medium
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N - Weakness
- CWE-200, CWE-306, CWE-862
- Updated
- 2026-11-02
Affected products
Public exploits
Links only. Every CVE stores no exploit code.
| Source | Link | Date |
|---|---|---|
| PoC in GitHub | 7megaumka7/FOSKiller | 2026-06-12 |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, NVD, OSV, PoC in GitHub |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-53647 is a medium vulnerability (CVSS 6.9) in Fossbilling, published July 6, 2026. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 0.54%, the 45th percentile. No source names a fixed version.