CVE-2026-33734: Improper Neutralization of Special Elements used in an SQL Command

FOSSBilling is a free, open-source billing and client management system. Versions 0.6.0 through 0.7.2 have a SQL injection vulnerability in the Massmailer module filter functionality. An authenticated administrator can supply crafted filter values when updating a mass email message, causing...

CVE-2026-53640: Exposure of Sensitive Information to an Unauthorized Actor

FOSSBilling is a free, open-source billing and client management system. Prior to version 0.8.0, low-privileged staff accounts may read sensitive data via admin API endpoints that lack permission checks. While sibling write endpoints correctly enforce fine-grained permissions, the corresponding...

CVE-2026-53643: Exposure of Sensitive Information to an Unauthorized Actor

FOSSBilling is a free, open-source billing and client management system. Versions prior to 0.8.0 allow low-privileged staff accounts to perform unauthorized actions via admin API endpoints. The root cause is a combination of the canalwaysaccess module flag which grants all staff access to certain...

CVE-2026-53642: Incorrect Authorization

FOSSBilling is a free, open-source billing and client management system. In versions 0.5.6 through 0.7.2, when the "Require Email Confirmation" setting is enabled, a logged-in client with an unverified email address emailapproved = 0 can access all client-area pages e.g. /client/balance,...

CVE-2026-53645: Improper Privilege Management

FOSSBilling is a free, open-source billing and client management system. Versions prior to 0.8.0 allow a low-privileged staff account to grant arbitrary module permissions to itself through the admin API, resulting in persistent privilege escalation. A staff user that only has...

CVE-2026-43921: Improper Control of Generation of Code

FOSSBilling is a free, open-source billing and client management system. Versions 0.6.10 through 0.7.2 have a PHP code injection vulnerability in FOSSBilling's Config::prettyPrintArrayToPHP method. When configuration values are updated, string values are written into config.php without escaping...

CVE-2026-43925: Improperly Controlled Modification of Dynamically-Determined Object Attributes

FOSSBilling is a free, open-source billing and client management system. Prior to version 0.8.0, an unauthenticated mass assignment vulnerability in the client self-registration endpoint allows any visitor to assign themselves to an arbitrary client group during sign-up. Because client groups can...

CVE-2026-43918: Insufficient Session Expiration

FOSSBilling is a free, open-source billing and client management system. Prior to version 0.8.0, when a client or staff/admin account is suspended or marked inactive, existing authenticated sessions are not invalidated. The session identity loaders in src/di.php loggedinclient and loggedinadmin...

CVE-2026-43927: Time-of-check Time-of-use (TOCTOU) Race Condition

FOSSBilling is a free, open-source billing and client management system. Prior to version 0.8.0, a race condition in the cart checkout flow allows an authenticated client to apply a promo code beyond its configured maximum uses. By sending concurrent checkout requests before any single request...

CVE-2026-42331: Missing Authentication for Critical Function

FOSSBilling is a free, open-source billing and client management system. Prior to version 0.8.0, the Guest API invoice/update endpoint is missing an authorization check present in other invoice-related endpoints, allowing an unauthenticated user with knowledge of an invoice hash to modify the...

CVE-2026-42341: Missing Authentication for Critical Function

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...

PT-2026-56036

Name of the Vulnerable Software and Affected Versions FOSSBilling versions prior to 0.8.0 Description Low-privileged staff accounts can perform unauthorized actions through admin API endpoints. This issue stems from the can always access module flag, which grants all staff access to specific...

PT-2026-56035

Name of the Vulnerable Software and Affected Versions FOSSBilling versions 0.5.6 through 0.7.2 Description When the Require Email Confirmation setting is enabled, a logged-in client with an unverified email address, indicated by the variable email approved = 0, can bypass page-side enforcement...

PT-2026-56038

Name of the Vulnerable Software and Affected Versions FOSSBilling versions prior to 0.8.0 Description A low-privileged staff account can grant arbitrary module permissions to itself, leading to persistent privilege escalation. A user possessing the staff.create and edit staff permission can call...

PT-2026-56037

Name of the Vulnerable Software and Affected Versions FOSSBilling versions 0.5.3 through 0.7.2 Description Authenticated clients can read and reset API key service secrets for orders that are not in an active state, such as suspended or canceled. This occurs due to missing order-state validation ...

PT-2026-56028

Name of the Vulnerable Software and Affected Versions FOSSBilling versions 0.6.10 through 0.7.2 Description An issue exists in the Config::prettyPrintArrayToPHP method where string values are written into the config.php file without escaping single quotes during configuration updates. Since...

PT-2026-56031

Name of the Vulnerable Software and Affected Versions FOSSBilling versions prior to 0.8.0 Description A race condition in the cart checkout flow allows an authenticated client to apply a promo code more times than its configured maximum limit. By sending concurrent checkout requests before the...

PT-2026-56033

Name of the Vulnerable Software and Affected Versions FOSSBilling versions prior to 0.8.0 Description Low-privileged staff accounts can read sensitive data through admin API endpoints that lack proper permission checks. Although write endpoints enforce fine-grained permissions, the corresponding...

CVE-2026-53646: Weak Password Recovery Mechanism for Forgotten Password

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 resetpassword guest API endpoint reuse the existing token instea...

CVE-2026-43928: Improper Check for Unusual or Exceptional Conditions

FOSSBilling is a free, open-source billing and client management system. Prior to version 0.8.0, the PayPalEmail payment adapter accepts PayPal IPN callbacks and credits the IPN-supplied amount mcgross to the client's balance without validating it against the invoice total. Combined with a $0.05...