FOSSBilling up to 0.7.2 Password Reset information disclosure

Summaryinfo

A vulnerability marked as problematic has been reported in FOSSBilling up to 0.7.2. The affected element is an unknown function of the component Password Reset Handler. Performing a manipulation results in information disclosure. This vulnerability is cataloged as CVE-2026-53646. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability classified as problematic has been found in FOSSBilling up to 0.7.2. This affects an unknown code of the component Password Reset Handler. The manipulation with an unknown input leads to a information disclosure vulnerability. CWE is classifying the issue as CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. This is going to have an impact on confidentiality. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-53646 since 06/09/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1592 for this issue.

Upgrading to version 0.8.0 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-41971). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• Billing Software

Name

• FOSSBilling

Version

• 0.7.0
• 0.7.1
• 0.7.2

Website

• Product: https://github.com/FOSSBilling/FOSSBilling/

CPE 2.3info

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CPE 2.2info

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Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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