microsoft simplechat up to 0.241.205 Plugin Validation plugin_validation_endpoint.py get_auth_security improper authorization

Summaryinfo

A vulnerability labeled as critical has been found in microsoft simplechat up to 0.241.205. The affected element is the function get_auth_security of the file application/single_app/plugin_validation_endpoint.py of the component Plugin Validation. Such manipulation leads to improper authorization. This vulnerability is referenced as CVE-2026-57206. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability, which was classified as critical, has been found in microsoft simplechat up to 0.241.205. Affected by this issue is the function get_auth_security of the file application/single_app/plugin_validation_endpoint.py of the component Plugin Validation. The manipulation with an unknown input leads to a improper authorization vulnerability. Using CWE to declare the problem leads to CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. Impacted is confidentiality, integrity, and availability. CVE summarizes:

SimpleChat is a secure AI conversation application with personal and group workspaces for document-grounded interactions. Prior to 0.241.206, several plugin validation routes in application/single_app/plugin_validation_endpoint.py, including `POST /api/admin/plugins/test-instantiation`, `GET /api/admin/plugins/health-check/<plugin_name>`, `POST /api/admin/plugins/repair/<plugin_name>`, and `POST /api/plugins/validate`, relied on @swagger_route(security=get_auth_security()) documentation without enforcing @login_required, @user_required, or @admin_required at runtime, allowing unauthenticated or unauthorized clients to invoke plugin validation, health, and repair behavior. This issue is fixed in version 0.241.206.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-57206 since 06/24/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 07/16/2026). This vulnerability is assigned to T1548.002 by the MITRE ATT&CK project.

Upgrading to version 0.241.206 eliminates this vulnerability.

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Productinfo

Type

• Chat Software

Vendor

• microsoft

Name

• simplechat

Version

• 0.241.205

License

• commercial

Website

• Vendor: https://www.microsoft.com/
• Product: https://github.com/microsoft/simplechat/

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