CVE-2026-53646

Description

FOSSBilling is a free, open-source billing and client management system. In versions 0.5.6 through 0.7.2, when a `ClientPasswordReset` record already exists for a client (from a previous unexpired reset request), subsequent calls to the `reset_password` guest API endpoint reuse the existing token instead of generating a new one. The 15-minute validity window is anchored to the first request's `created_at` timestamp, not the time of the most recent email. An attacker who obtained the original reset link remains able to use it even after the victim requests a new reset, because the original token is never invalidated or rotated. Version 0.8.0 patches the issue. Some workarounds are available. Configure a reverse proxy (e.g., Nginx, Apache, Cloudflare) to apply per-IP rate limiting to the `/client/reset-password` endpoint to minimize the window of opportunity, and/or manually clear expired `client_password_reset` records from the database after a client reports a suspected compromise.

Weakness Type (CWE)

CWE-640 CWE-640

References

Other References

https://github.com/FOSSBilling/FOSSBilling/security/advisories/GHSA-vp66-w6rc-x32p

Frequently Asked Questions

What is CVE-2026-53646? +

FOSSBilling is a free, open-source billing and client management system. In versions 0.5.6 through 0.7.2, when a `ClientPasswordReset` record already exists for a client (from a previous unexpired reset request), subsequent calls to the `reset_password` guest API endpoint reuse the existing token instead of generating a new one. The 15-minute validity window is anchored to the first request's `created_at` timestamp, not the time of the most recent email. An attacker who obtained the original reset link remains able to use it even after the victim requests a new reset, because the original token is never invalidated or rotated. Version 0.8.0 patches the issue. Some workarounds are available. Configure a reverse proxy (e.g., Nginx, Apache, Cloudflare) to apply per-IP rate limiting to the `/client/reset-password` endpoint to minimize the window of opportunity, and/or manually clear expired `client_password_reset` records from the database after a client reports a suspected compromise.

How do I check if I'm vulnerable to CVE-2026-53646? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

Related Vulnerabilities

CVE-2025-29995

This vulnerability exists in the CAP back office application due to a weak password-reset mechanism implemented at API endpoints. An …

CVE-2025-53373

Natours is a Tour Booking API. The attacker can easily take over any victim account by injecting an attacker-controlled server …

CVE-2023-7028 10.0

An issue has been discovered in GitLab CE/EE affecting all versions from 16.1 prior to 16.1.6, 16.2 prior to 16.2.9, …

CVE-2024-11350 9.8

The AdForest theme for WordPress is vulnerable to privilege escalation via account takeover in all versions up to, and including, …

CVE-2025-22144 9.8

NamelessMC is a free, easy to use & powerful website software for Minecraft servers. A user with admincp.core.emails or admincp.users.edit …

CVE-2025-31380 9.8

Weak Password Recovery Mechanism for Forgotten Password vulnerability in videowhisper Paid Videochat Turnkey Site ppv-live-webcams allows Password Recovery Exploitation.This issue …