# CVE-2026-53647: FOSSBilling information disclosure in Guest serviceapikey/get_info API

Source: https://junglewise.ai/threats/cve-2026-53647-fossbilling-information-disclosure-in-guest-serviceapikey-get  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-07. Updated: 2026-07-07  
License: CC BY 4.0 with a link back

CVE-2026-53647 · Severity: info · CVSS 6.9 · Published 2026-07-07

FOSSBilling is an open-source platform used by businesses to manage client billing and automated services. A security flaw allows anyone with a valid API key to view internal configuration data that should be restricted to administrators. This could expose sensitive business information such as internal pricing discounts, feature limits, and account expiration details.

Technologies: [FOSSBilling](https://junglewise.ai/threats/technologies/fossbilling). Vendors: [FOSSBilling](https://junglewise.ai/threats/vendors/fossbilling).

## Quick answers

**Is CVE-2026-53647 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-53647 being exploited in the wild.

**How severe is CVE-2026-53647?** Informational severity, with a CVSS score of 6.9, published 7 July 2026.

**Which products and versions are affected?** FOSSBilling >= 0.5.3, <= 0.7.2.

**Is there a fix for CVE-2026-53647?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-53647 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-53647?** Check whether you run FOSSBilling at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

An information disclosure vulnerability exists in the Guest 'serviceapikey/get_info' API endpoint due to missing authentication and authorization checks. The 'get_info()' method in 'src/modules/Serviceapikey/Api/Guest.php' retrieves the full database record for a provided API key, including all 'custom_*' configuration fields. While the endpoint is intended for guest use, it fails to restrict access to sensitive metadata such as rate limits, feature flags, and internal pricing tiers. An attacker with a valid API key can query this endpoint to extract administrative configuration parameters. The issue is resolved in version 0.8.0.

## Affected products

- FOSSBilling FOSSBilling >= 0.5.3, <= 0.7.2

## Timeline

- 2026-06-12: advisory: GitHub Security Advisory published
- 2026-07-07: disclosed: NVD publication date

## References

- [https://github.com/FOSSBilling/FOSSBilling/security/advisories/GHSA-737q-9gpr-6mpq](https://github.com/FOSSBilling/FOSSBilling/security/advisories/GHSA-737q-9gpr-6mpq)

## Related threats

- [FOSSBilling stored XSS in support ticket notes](https://junglewise.ai/threats/cve-2026-111048-fossbilling-is-an-open-source-billing-and-client-management)
- [FOSSBilling CSRF vulnerability in staff guest login endpoint](https://junglewise.ai/threats/cve-2026-112374-fossbilling-before-0-8-9-contains-a-cross-site-request-forgery)
- [FOSSBilling email enumeration via guest signup endpoint](https://junglewise.ai/threats/cve-2026-111056-fossbilling-is-an-open-source-billing-and-client-management)
- [FOSSBilling path traversal in template_exists endpoint](https://junglewise.ai/threats/cve-2026-111053-fossbilling-is-an-open-source-billing-and-client-management)
- [FOSSBilling authorization bypass in extension configuration management](https://junglewise.ai/threats/cve-2026-111046-fossbilling-is-an-open-source-billing-and-client-management)