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

Quick assessment

Affected
microsoft simplechat
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Microsoft SimpleChat是美国Microsoft公司开源的一个基于大语言模型（LLM）的综合性 AI 聊天应用程序。 Microsoft SimpleChat 0.241.206之前版本存在授权问题漏洞，该漏洞源于插件验证路由缺少运行时强制身份验证，允许未经身份验证或未经授权的客户端调用插件验证、健康和修复行为。

CVSS 8.6 · High EPSS 0.89% · P56

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
microsoft simplechat < 0.241.206 affected
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I. Basic Information for CVE-2026-57206

Vulnerability Information
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Vulnerability Title
SimpleChat plugin validation endpoints missing authentication and authorization
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
Microsoft SimpleChat 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Microsoft SimpleChat是美国Microsoft公司开源的一个基于大语言模型（LLM）的综合性 AI 聊天应用程序。 Microsoft SimpleChat 0.241.206之前版本存在授权问题漏洞，该漏洞源于插件验证路由缺少运行时强制身份验证，允许未经身份验证或未经授权的客户端调用插件验证、健康和修复行为。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
microsoft simplechat < 0.241.206 -

II. Public POCs for CVE-2026-57206

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 10512 chars
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III. Intelligence Information for CVE-2026-57206

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Vendor Advisories for CVE-2026-57206 (1)

Security Blog Posts for CVE-2026-57206 (1)

Vendor Pages for CVE-2026-57206 (1)

Same Patch Batch · microsoft · 2026-07-16 · 20 CVEs total

CVE-2026-59866 9.3 CRITICAL Kiota: Arbitrary file write + code-injection via x-ms-kiota-info clientClassName and clien
CVE-2026-59864 9.3 CRITICAL Kiota: Path/URL injection into generated Copilot plugin manifest via x-ai-* extensions
CVE-2026-59865 9.3 CRITICAL Kiota: Command injection via x-ms-kiota-info dependencyInstallCommand surfaced by `kiota i
CVE-2026-59860 8.7 HIGH Kiota: XML Doc-Comment Newline Breakout Code Injection
CVE-2026-59859 8.7 HIGH Kiota: Code Generation Literal Injection in the PHP Generator
CVE-2026-59117 7.5 HIGH Windows Terminal Remote Code Execution Vulnerability
CVE-2026-59861 7.5 HIGH Kiota: Code Generation Literal Injection in Kiota Ruby Generator
CVE-2026-59862 7.5 HIGH Kiota: Code Generation Literal Injection in the Python Generator
CVE-2026-53598 7.5 HIGH Prompty: Arbitrary File Read via ${file:path} Reference Expansion
CVE-2026-59867 7.1 HIGH Kiota: Generation-time SSRF + remote/local file inclusion via unrestricted $ref
CVE-2026-58598 7.0 HIGH Windows Backup Service Elevation of Privilege Vulnerability
CVE-2026-59863 7.0 HIGH Kiota: Workspace-config poisoning: out-of-repo file write + generation-time SSRF
CVE-2026-55440 6.5 MEDIUM Microsoft UFO: COMMAND_RESULTS handler creates unowned sessions, allowing authenticated se
CVE-2026-58643 6.1 MEDIUM Windows Admin Center Spoofing Vulnerability
CVE-2026-62826 4.6 MEDIUM Microsoft SharePoint Server Spoofing Vulnerability
CVE-2026-57205 4.3 MEDIUM SimpleChat: Authenticated users can access other users' profile metadata through user IDOR
CVE-2026-54568 4.3 MEDIUM Microsoft UFO: Missing Authorization in DEVICE_INFO_REQUEST Allows a DEVICE Client to Read
CVE-2026-54733 moodle-local_o365: Authentication bypass via unverified JWT signature in Teams SSO endpoin
CVE-2026-53597 Prompty: Arbitrary code execution via JavaScript frontmatter in TypeScript loader

IV. Related Vulnerabilities

Same product: simplechat
Same vendor: microsoft
Same weakness: CWE-306

V. Comments for CVE-2026-57206

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