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NVD description
FOSSBilling is a free, open-source billing and client management system. Versions 0.6.0 through 0.7.2 have an unauthenticated payment bypass vulnerability in FOSSBilling's IPN callback endpoint. When the Custom payment adapter is enabled, an attacker can mark any unpaid invoice as paid and credit the associated client account without making an actual payment, by sending a single crafted HTTP request. Version 0.8.0 patches the issue. Some workarounds are available. Disable the Custom payment gateway if not actively needed and/or restrict access to `/ipn.php` at the web server level (e.g., via IP allowlisting), noting that this may interfere with legitimate payment callback processing.
Priority
LOW
Exploitation
NONE
PoC
NONE
Patch
NONE
Momentum
NONE
🐛 VULNERABILITIES CVE Notify: 🚨 [CVE-2026-42341](https://github.com/FOSSBilling/FOSSBilling/security/advisories/GHSA-5493-9m76-2q... https://github.com/FOSSBilling/FOSSBilling/security/advisories/GHSA-5493-9m76-2qrr #CVE #ZeroDay #PatchManagement
Post summary
The post announces CVE-2026-42341 with a link to a GitHub advisory, but offers no further technical or exploit details.