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CVE-2026-45350— Open WebUI: Chat completion API allows tool restrictions to be bypassed

Quick assessment

Affected
open-webui open-webui
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Open WebUI是Open WebUI开源的一个可扩展、功能丰富、用户友好的自托管 WebUI。 Open WebUI 0.8.6之前版本存在安全漏洞，该漏洞源于聊天完成API中工具ID和工具服务器参数由用户提供且未检查用户权限，可能导致用户调用任何服务器工具并使用服务器特权执行。

CVSS 7.1 · High EPSS 0.37% · P29

Affected Version Matrix 1

VendorProduct Version RangeStatus
open-webui open-webui < 0.8.6 affected
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I. Basic Information for CVE-2026-45350

Vulnerability Information
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Vulnerability Title
Open WebUI: Chat completion API allows tool restrictions to be bypassed
Source: CVE Program / CVE List V5
Vulnerability Description
Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.8.6, there is a vulnerability in chat completion API, which allows attackers to bypass tool restrictions, potentially enabling unauthorized actions or access. In the chat_completion API, the parameters tool_ids and tool_servers are supplied by the user. These parameters are used to create a tools_dict by the middleware. This is then used by get_tool_by_id to retrieve the appropriate tool. However, there is no checks in that ensures the user that uses the API has permission to use the tool, meaning that a user can invoke any server tool by supplying the correct tool_id or tool_servers parameters via the chat completion API. Moreover, the authentication token stored in the server would be used when invoking the tool, so the tool will be invoked with the server privilege. This vulnerability is fixed in 0.8.6.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
Open WebUI 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Open WebUI是Open WebUI开源的一个可扩展、功能丰富、用户友好的自托管 WebUI。 Open WebUI 0.8.6之前版本存在安全漏洞，该漏洞源于聊天完成API中工具ID和工具服务器参数由用户提供且未检查用户权限，可能导致用户调用任何服务器工具并使用服务器特权执行。
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
open-webui open-webui < 0.8.6 -

II. Public POCs for CVE-2026-45350

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III. Intelligence Information for CVE-2026-45350

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Vendor Advisories for CVE-2026-45350 (1)

Same Patch Batch · open-webui · 2026-05-15 · 59 CVEs total

CVE-2026-44551 9.1 CRITICAL Open WebUI: LDAP Empty Password Authentication Bypass
CVE-2026-45672 8.8 HIGH Open WebUI: Jupyter code execution works despite `ENABLE_CODE_EXECUTION=false` — feature g
CVE-2026-44552 8.7 HIGH Open WebUI: Redis Cache Keys tool_servers and terminal_servers Missing Instance Prefix Ena
CVE-2026-45315 8.7 HIGH Open WebUI: Stored XSS via attacker-controlled file extension in /api/v1/audio/transcripti
CVE-2026-45331 8.5 HIGH Open WebUI: Full SSRF Vulnerability in the RAG Web Search Feature
CVE-2026-45400 8.5 HIGH Open WebUI: Server-Side Request Forgery (SSRF) bypass in `validate_url`
CVE-2026-45401 8.5 HIGH Open WebUI: SSRF Bypass via HTTP Redirect Following in Web-Fetch and Image-Load Endpoints
CVE-2026-44570 8.3 HIGH Open WebUI: Inconsistent authorization controls within memories API
CVE-2026-45665 8.1 HIGH Open WebUI: Stored XSS in Banner Component via Improper Sanitization Order
CVE-2026-44553 8.1 HIGH Open WebUI: Stale Admin Role in Socket.IO Session Pool Enables Post-Demotion Cross-User No
CVE-2026-44565 8.1 HIGH Open WebUI: Open WebUI Arbitrary File Write, Delete via Path Traversal
CVE-2026-45675 8.1 HIGH Open WebUI: LDAP and OAuth First-User Race Condition Allows Multiple Admin Accounts
CVE-2026-45402 8.1 HIGH Open WebUI: Cross-User File Access via Unchecked file_id in Folder Knowledge and Knowledge
CVE-2026-44554 8.1 HIGH Open WebUI: Knowledge Base Destruction and RAG Poisoning via Unauthorized Collection Overw
CVE-2026-45301 8.1 HIGH Open WebUI: Missing permission check in files API allows authenticated users to list, acce
CVE-2026-45671 8.0 HIGH Open WebUI: shared-chat branch ignores access_type, allowing unauthorized file deletion
CVE-2026-45338 7.7 HIGH Open WebUI: SSRF via OAuth Profile Picture URL in _process_picture_url (oauth.py)
CVE-2026-45303 7.7 HIGH Open WebUI: Stored XSS via the HTML renedering view
CVE-2026-44555 7.6 HIGH Open WebUI: Base Model Routing Bypasses Access Control via Model Chaining
CVE-2026-45398 7.5 HIGH Open WebUI: IDOR - Retrieval API Bypasses Knowledge Base Access Controls

Showing top 20 of 59 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: open-webui
Same vendor: open-webui
Same weakness: CWE-862

V. Comments for CVE-2026-45350

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