CVE-2026-44555— Open WebUI: Base Model Routing Bypasses Access Control via Model Chaining
Affected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| open-webui | open-webui | < 0.9.0 | affected |
Get alerts for future matching vulnerabilitiesLog in to subscribe
I. Basic Information for CVE-2026-44555
Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗ Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.
Vulnerability Title
Open WebUI: Base Model Routing Bypasses Access Control via Model Chaining
Source: NVD (National Vulnerability Database)
Vulnerability Description
Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.0, Open WebUI supports model composition via base_model_id: a user-defined model (e.g., "Cheap Assistant") can reference an existing base model (e.g., "gpt-4-turbo-restricted") that provides the actual inference capability. When a user queries the composed model, the access control pipeline verifies the user has access to the composed model but never re-verifies access to the chained base model. Additionally, the model creation and import endpoints accept arbitrary base_model_id values without checking that the caller has access to that base model. Combined, this allows any user with the default model creation permission to create a model that chains to a restricted base model — and then invoke it, causing the server to dispatch the request to the restricted base model using the admin-configured API key. This vulnerability is fixed in 0.9.0.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:L
Source: NVD (National Vulnerability Database)
Vulnerability Type
授权机制缺失
Source: NVD (National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| open-webui | open-webui | < 0.9.0 | - |
II. Public POCs for CVE-2026-44555
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POCPremium
No public POC found.
Login to generate AI POCIII. Intelligence Information for CVE-2026-44555
请登录查看更多情报信息。
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-2026-45315 | 8.7 HIGH | Open WebUI: Stored XSS via attacker-controlled file extension in /api/v1/audio/transcripti |
| CVE-2026-44552 | 8.7 HIGH | Open WebUI: Redis Cache Keys tool_servers and terminal_servers Missing Instance Prefix Ena |
| 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-2026-44565 | 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-2026-44553 | 8.1 HIGH | Open WebUI: Stale Admin Role in Socket.IO Session Pool Enables Post-Demotion Cross-User No |
| 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-2026-45665 | 8.1 HIGH | Open WebUI: Stored XSS in Banner Component via Improper Sanitization Order |
| CVE-2026-45402 | 8.1 HIGH | Open WebUI: Cross-User File Access via Unchecked file_id in Folder Knowledge and Knowledge |
| 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-2026-45398 | 7.5 HIGH | Open WebUI: IDOR - Retrieval API Bypasses Knowledge Base Access Controls |
| CVE-2026-44566 | 7.3 HIGH | Open WebUI: Arbitrary File Upload and Path Traversal |
Showing top 20 of 59 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: open-webui
- CVE-2026-45338
Open WebUI: SSRF via OAuth Profile Picture URL in _process_p - CVE-2026-44549
Open WebUI: Stored XSS in excel file preview - CVE-2026-45299
Open WebUI: Stored Cross-Site Scripting In Profile Picture - CVE-2026-45665
Open WebUI: Stored XSS in Banner Component via Improper Sani - CVE-2026-45667
Open WebUI: Unauthenticated endpoint can trigger embedding g
Same vendor: open-webui
- CVE-2026-45338
Open WebUI: SSRF via OAuth Profile Picture URL in _process_p - CVE-2026-44549
Open WebUI: Stored XSS in excel file preview - CVE-2026-45299
Open WebUI: Stored Cross-Site Scripting In Profile Picture - CVE-2026-45665
Open WebUI: Stored XSS in Banner Component via Improper Sani - CVE-2026-45667
Open WebUI: Unauthenticated endpoint can trigger embedding g
Same weakness: CWE-862
- CVE-2025-4202
Multicollab: Content Team Collaboration and Editorial Workfl - CVE-2026-8681
Essential Chat Support <= 1.0.1 - Missing Authorization to U - CVE-2026-45667
Open WebUI: Unauthenticated endpoint can trigger embedding g - CVE-2026-44571
Open WebUI: Improper Authorization in Standard Channels Allo - CVE-2026-45350
Open WebUI: Chat completion API allows tool restrictions to
V. Comments for CVE-2026-44555
No comments yet