CVE-2026-27604

FOSSBilling 0.5.4–0.7.x contains an authorization bypass in the API role handling that permits unauthenticated access to privileged /api/system/* endpoints. The issue maps to the system identity (cron admin), allowing admin API methods without credentials, session, or CSRF tokens. Version 0.8.0 i...

CVE-2026-27604 FOSSBilling: Improper API Role Validation (system) Enables Unauthenticated Access to Privileged Admin Functions

FOSSBilling is a free, open-source billing and client management system. Starting in version 0.5.4 and prior to version 0.8.0, an authorization bypass in the API role handling allows unauthenticated access to privileged /api/system/ endpoints. Because system resolves to the cron admin identity,...

CVE-2026-27604 FOSSBilling: Improper API Role Validation (system) Enables Unauthenticated Access to Privileged Admin Functions

FOSSBilling is a free, open-source billing and client management system. Starting in version 0.5.4 and prior to version 0.8.0, an authorization bypass in the API role handling allows unauthenticated access to privileged /api/system/ endpoints. Because system resolves to the cron admin identity,...

CVE-2026-27604

FOSSBilling is a free, open-source billing and client management system. Starting in version 0.5.4 and prior to version 0.8.0, an authorization bypass in the API role handling allows unauthenticated access to privileged /api/system/ endpoints. Because system resolves to the cron admin identity,...

CVE-2026-27604 FOSSBilling: Improper API Role Validation (system) Enables Unauthenticated Access to Privileged Admin Functions

FOSSBilling is a free, open-source billing and client management system. Starting in version 0.5.4 and prior to version 0.8.0, an authorization bypass in the API role handling allows unauthenticated access to privileged /api/system/ endpoints. Because system resolves to the cron admin identity,...

CVE-2026-28496

CVE-2026-28496 – FOSSBilling SSTI in Twig rendering affects versions prior to 0.8.0. Administrators with access to Twig-rendering features (email templates, mass mail campaigns, custom payment adapters, and the string_render API) can inject Twig expressions, leading to information disclosure and ...

EUVD-2026-38455

FOSSBilling is a free, open-source billing and client management system. Versions prior to 0.8.0 have a Server-Side Template Injection SSTI vulnerability in the template rendering system. Administrators with access to features that render Twig templates email templates, mass mail campaigns, custo...

CVE-2026-28496 FOSSBilling: Server-side template injection in Twig template rendering enables information disclosure and RCE

FOSSBilling is a free, open-source billing and client management system. Versions prior to 0.8.0 have a Server-Side Template Injection SSTI vulnerability in the template rendering system. Administrators with access to features that render Twig templates email templates, mass mail campaigns, custo...

CVE-2026-28496 FOSSBilling: Server-side template injection in Twig template rendering enables information disclosure and RCE

FOSSBilling is a free, open-source billing and client management system. Versions prior to 0.8.0 have a Server-Side Template Injection SSTI vulnerability in the template rendering system. Administrators with access to features that render Twig templates email templates, mass mail campaigns, custo...

CVE-2026-28496 FOSSBilling: Server-side template injection in Twig template rendering enables information disclosure and RCE

FOSSBilling is a free, open-source billing and client management system. Versions prior to 0.8.0 have a Server-Side Template Injection SSTI vulnerability in the template rendering system. Administrators with access to features that render Twig templates email templates, mass mail campaigns, custo...

CVE-2026-28496

FOSSBilling is a free, open-source billing and client management system. Versions prior to 0.8.0 have a Server-Side Template Injection SSTI vulnerability in the template rendering system. Administrators with access to features that render Twig templates email templates, mass mail campaigns, custo...

CVE-2025-64105: Authorization Bypass Through User-Controlled Key

FOSSBilling is a billing and client management system that automates invoicing, payments, and communication for online service businesses. Versions 0.6.21 through 0.7.2 are vulnerable to IDOR through the support ticket creation workflow. By manipulating relid when reltype=order, an authenticated...

PT-2026-51591

Name of the Vulnerable Software and Affected Versions FOSSBilling versions prior to 0.8.0 Description A query-construction flaw in client list endpoints allows authenticated clients to bypass tenant scoping and retrieve data from other clients. The issue occurs in the getSearchQuery functions of...

PT-2026-51584

Name of the Vulnerable Software and Affected Versions FOSSBilling versions 0.6.21 through 0.7.2 Description An Insecure Direct Object Reference IDOR exists in the support ticket creation workflow. An authenticated client can create a support ticket that references an order belonging to another...

CVE-2026-27604: Exposure of Sensitive Information to an Unauthorized Actor

FOSSBilling is a free, open-source billing and client management system. Starting in version 0.5.4 and prior to version 0.8.0, an authorization bypass in the API role handling allows unauthenticated access to privileged /api/system/ endpoints. Because system resolves to the cron admin identity,...

CVE-2026-28496: Improper Neutralization of Special Elements Used in a Template Engine

FOSSBilling is a free, open-source billing and client management system. Versions prior to 0.8.0 have a Server-Side Template Injection SSTI vulnerability in the template rendering system. Administrators with access to features that render Twig templates email templates, mass mail campaigns, custo...

CVE-2026-23513: Incorrect Authorization

FOSSBilling is a free, open-source billing and client management system. In versions 0.7.2 and prior, a query-construction flaw in client list endpoints allowed authenticated clients to bypass tenant scoping and retrieve other clients’ data. Details In ServiceTransaction::getSearchQuery and...

Exploit for CVE-2026-53646

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CVE-2026-43924

FOSSBilling is a free, open-source billing and client management system. Prior to version 0.8.0, the Redirect module does not validate the URL scheme of administrator-configured destination URLs before storing or issuing redirects. This allows arbitrary external URLs to be configured as redirect...

CVE-2026-40495

FOSSBilling is a free, open-source billing and client management system. Versions prior to 0.8.0 leak the exact system version through asset cache buster parameters in HTML output, bypassing the hideversionpublic security setting. The FOSSBilling version is embedded in the query string of every...