High 8.6Published Jul 16, 2026

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

Updated under an hour ago (Oct 28, 2026, 6:30 AM ET)

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Exploited in the last 30 days

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.

CVSS: 8.6 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L
Weakness (CWE): CWE-306, CWE-862
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: Jul 16, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

microsoft simplechat microsoft:simplechat (from the name)	before 0.241.206	CNA record

References

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.