Microsoft SimpleChat up to 0.241.202 User Settings route_backend_users.py user_id improper authorization

Summaryinfo

A vulnerability was found in Microsoft SimpleChat up to 0.241.202. It has been rated as problematic. This vulnerability affects unknown code of the file application/single_app/route_backend_users.py of the component User Settings Handler. The manipulation of the argument user_id leads to improper authorization. This vulnerability is uniquely identified as CVE-2026-57205. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability was found in Microsoft SimpleChat up to 0.241.202. It has been rated as problematic. This issue affects an unknown function of the file application/single_app/route_backend_users.py of the component User Settings Handler. The manipulation of the argument user_id 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. The summary by CVE is:

SimpleChat is a secure AI conversation application with personal and group workspaces for document-grounded interactions. Prior to 0.241.203, the authenticated GET /api/user/info/<user_id> and GET /api/user/profile-image/<user_id> endpoints in application/single_app/route_backend_users.py accepted a caller-supplied user_id and read the matching Cosmos DB user-settings document without object-level authorization, allowing a low-privilege authenticated user to retrieve another user's email address, display name, and profile image. This issue is fixed in version 0.241.203.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-57205 since 06/24/2026. The exploitation is known to be easy. The attack may be initiated remotely. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 07/16/2026). The attack technique deployed by this issue is T1548.002 according to MITRE ATT&CK.

Upgrading to version 0.241.203 eliminates this vulnerability.

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Productinfo

Type

• Chat Software

Vendor

• Microsoft

Name

• SimpleChat

Version

• 0.241.202

License

• commercial

Website

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

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