Microsoft Simplechat vulnerabilities

4 CVEs affecting Microsoft Simplechat, 0 known to be exploited (CISA KEV), with EPSS scores. Latest: CVE-2026-105798, published 2026-10-06.

Highest priority

Known exploited (CISA KEV) first, then by EPSS exploit probability.

CVE-2026-57206, published 2026-07-16. High severity, CVSS 8.6. EPSS: 1% chance of exploitation in the next 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…
CVE-2026-57205, published 2026-07-16. Medium severity, CVSS 4.3. EPSS: 0.9% chance of exploitation in the next 30 days. 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…
CVE-2026-105797, published 2026-10-06. High severity, CVSS 8.8. EPSS: 0.6% chance of exploitation in the next 30 days. SimpleChat is a secure AI conversation application with personal and group workspaces for document-grounded interactions. In versions 0.261.003 and 0.261.027, an authorization ordering flaw in POST…
CVE-2026-105798, published 2026-10-06. High severity, CVSS 8.7. EPSS: 0.5% chance of exploitation in the next 30 days. SimpleChat is a secure AI conversation application with personal and group workspaces for document-grounded interactions. Prior to 0.261.029, POST /api/group_documents/upload stores an…