Vulnerability · Published Jul 16, 2026 · Assigned by GitHub_M

CVE-2026-57206SimpleChat plugin validation endpoints missing authentication and authorization

High 8.6

In plain English

A high-severity missing authentication in simplechat from microsoft. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.0% (higher than 62% of all known vulnerabilities).

Severity (CVSS 3.1)8.6High

Exploit odds (30 days)1.0%top 38.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

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.

Affected products (as reported)

Vendor	Product	Versions
microsoft	simplechat	< 0.241.206

Weakness: CWE-306, CWE-862 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L

References

https://github.com/microsoft/simplechat/security/advisories/GHSA-g6gr-xp46-hrmj x_refsource_CONFIRM
https://github.com/microsoft/simplechat/blob/main/docs/explanation/fixes/PLUGIN_VALIDATION_ROUTE_AUTH_FIX.md x_refsource_MISC
https://github.com/microsoft/simplechat/releases/tag/v0.250.001 x_refsource_MISC