Sign in
Deutsch English Español Polski
High

Open WebUI's responses passthrough endpoint lacks access control authorization

  • Disclosed: 08.05.2026
  • Updated: 11.10.2026 14:18

Summary

The /responses endpoint in the OpenAI router accepts any authenticated user and forwards requests directly to upstream LLM providers without enforcing per-model access control. While the primary chat completion endpoint (generate_chat_completion) checks model ownership, group membership, and AccessGrants before allowing a request, the /responses proxy only validates that the user has a valid session via get_verified_user.

This allows any authenticated user — regardless of role or group assignment — to interact with any model configured on the instance by sending a POST request to /api/openai/responses with an arbitrary model ID.

Impact

As per OWASP TOP 10 LLM:

  • Model Denial of Service (OWASP LLM04): An unauthorized user can submit resource-intensive requests to expensive models (e.g., o1-pro, GPT-4o) that were explicitly restricted by the administrator. In shared deployments, this can exhaust API budgets or rate limits, causing total service disruption for all legitimate users.

  • Model Theft (OWASP LLM10): If the instance proxies access to fine-tuned or self-hosted models, unauthorized users can freely interact with them, enabling capability extraction or model distillation without authorization.

  • Access Policy Bypass: Administrators lose the ability to enforce cost-tier restrictions, team-based model assignments, or compliance boundaries through the existing access control system.

The endpoint is a raw passthrough proxy and does not resolve workspace model configurations (system prompts, knowledge bases, RAG pipelines). Therefore, workspace-specific confidential data is not directly exposed through this vector.

PR: https://github.com/open-webui/open-webui/pull/23481

Affected software

Click a technology to see all vulnerabilities affecting it.

PlatformPackageVulnerable versionsFixed in
Python (PyPI) open-webui < 0.9.0 0.9.0

References

CVSS score 7.1/10
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H
Weakness (CWE)
CWE-284, CWE-862
Platform
Python (PyPI)
Package
open-webui
Disclosed
08.05.2026
Updated
11.10.2026 14:18

Sources and licenses

OSV / GitHub Advisory Database - PYSEC-2026-2734 - PyPA Advisory Database; CC BY 4.0

OSV / GitHub Advisory Database - GHSA-hp5m-24vp-vq2q - CC BY 4.0

Vulnerability history: open-webui

All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.

All (161) in the archive
Total entries
161
First → latest
08.2024 09.2026
Without a fix
11
Exploited in attacks
0

Severity breakdown

  • Critical 1
  • High 77
  • Medium 75
  • Low 8

Disclosures per year

Severity:
  1. Open WebUI's responses passthrough endpoint lacks access control authorization this entry
    High · 7.1 CVE-2026-44556 < 0.9.0 0.9.0
  2. Open WebUI: Unauthenticated requests can stall the server via uncached OIDC fetches in back-channel logout
    High · 7.5 CVE-2026-87011 >= 0.9.0, < 0.11.1 0.11.1
  3. Open WebUI: Sign-in as another user via wildcard characters in the OAuth subject claim on SQLite
    High · 8.1 CVE-2026-87016 >= 0.6.41, < 0.11.1 0.11.1
  4. Open WebUI: Same-origin XSS to account takeover via terminal port-preview iframe hardcoding allow-same-origin
    High · 8.7 CVE-2026-87995 >= 0.8.11, < 0.11.1 0.11.1
  5. Open WebUI: SSRF into internal services via DNS rebinding in the Playwright web loader
    High · 7.7 CVE-2026-87996 >= 0.9.6, < 0.11.1 0.11.1
  6. Open WebUI: Non-admin users can delete admin-owned external knowledge connections via knowledge base deletion
    High · 7.1 CVE-2026-87998 >= 0.10.0, < 0.11.1 0.11.1
  7. Open WebUI: Any authenticated user can reach the Azure platform channel via server-side web fetch
    High · 7.1 CVE-2026-87999 < 0.11.1 0.11.1
  8. Open WebUI: A folder write-collaborator can permanently delete the owner's chats by deleting a shared subfolder
    High · 8.1 CVE-2026-70494 >= 0.10.0, < 0.11.0 0.11.0
  9. Open WebUI: Stored XSS via unescaped KaTeX render-error fallback in rendered messages
    High · 8.7 CVE-2026-70492 >= 0.10.0, < 0.11.0 0.11.0
  10. Open WebUI: Same-origin XSS to account takeover via terminal file-preview iframe hardcoding allow-same-origin
    High · 8.2 CVE-2026-70486 >= 0.9.0, < 0.11.0 0.11.0
  11. Open WebUI: Any authenticated user can reach internal services and cloud metadata via NAT64-encoded URLs
    High · 7.1 CVE-2026-70485 >= 0.9.0, < 0.11.0 0.11.0
  12. Open WebUI: Account takeover via OAuth token exchange accepting tokens issued to any client
    High · 8.1 CVE-2026-70482 >= 0.8.0, < 0.11.0 0.11.0
  13. Open WebUI: SSRF into internal services via unvalidated sub-resource requests in the Playwright web loader
    High · 7.7 CVE-2026-70479 >= 0.9.6, < 0.11.0 0.11.0
  14. open-webui terminal proxy path traversal guard bypass via 9x encoded traversal
    High · 7.7 CVE-2026-59221 >= 0.9.6, < 0.10.0 0.10.0
  15. Open WebUI: Terminal proxy forwards a spoofable, integrity-unbound user identity to the upstream (X-User-Id header and ws_terminal session_id query injection)
    High · 8.0 CVE-2026-59224 < 0.10.0 0.10.0
  16. Open WebUI: Cross-user code-interpreter and tool execution via unvalidated Socket.IO event-caller session_id
    High · 7.7 CVE-2026-59216 < 0.10.0 0.10.0
  17. Open WebUI: Cross-channel message overwrite via chat completion API (single-model and multimodel message_ids)
    High · 7.1 CVE-2026-59714 >= 0.9.5, < 0.10.0 0.10.0
  18. Open WebUI: Realtime endpoints accept Redis-revoked JWTs after signout/backchannel logout
    High · 7.1 CVE-2026-59219 >= 0.9.0, < 0.10.0 0.10.0
  19. Open WebUI: Stored web worker XSS via Pyodide
    High · 7.3 CVE-2026-59214 < 0.10.0 0.10.0
  20. Open WebUI vulnerable to Stored XSS via iFrame embeds in response messages
    High · 7.3 CVE-2026-26193 < 0.6.44 0.6.44
  21. Open WebUI vulnerable to Stored XSS via iFrame in citations model
    High · 7.3 CVE-2026-26192 < 0.7.0 0.7.0
  22. Open WebUI vulnerable to stored XSS via unescaped markdown token in MarkdownTokens.svelte leading to full account takeover and RCE via functions
    High CVE-2025-46719 < 0.6.6 0.6.6
  23. Open WebUI: SSRF Protection Bypass in Playwright Web Loader via HTTP Redirects
    High · 7.7 CVE-2026-54018 < 0.9.6 0.9.6
  24. Open WebUI: Path traversal / SSRF in terminal server proxy via encoded path traversal
    High · 7.7 CVE-2026-54017 < 0.9.6 0.9.6
  25. Open WebUI: Stored XSS to Account Takeover via Model Profile Images
    High · 7.6 CVE-2026-54013 < 0.9.6 0.9.6
  26. Open WebUI: Forged model meta.knowledge allows cross-user file read and deletion
    High · 7.1 CVE-2026-54012 < 0.9.6 0.9.6
  27. Open WebUI: Stored XSS in Mermaid Markdown Preview
    High · 8.7 CVE-2026-54011 < 0.9.6 0.9.6
  28. Open WebUI: Forged chat-file link allows cross-user file read and deletion
    High · 8.3 CVE-2026-54010 < 0.9.6 0.9.6
  29. Open WebUI: Redirect-Bypass SSRF in OAuth `_process_picture_url` (incomplete-fix sibling of CVE-2026-45401)
    High · 8.5 CVE-2026-54008 < 0.9.6 0.9.6
  30. Open WebUI: Cross-origin postMessage confirmation bypass via action:submit
    High · 6.5 CVE-2026-54007 < 0.9.6 0.9.6
  31. Open WebUI: LDAP and OAuth First-User Race Condition Allows Multiple Admin Accounts
    High · 8.1 CVE-2026-45675 < 0.9.0 0.9.0
  32. Open WebUI: Jupyter code execution works despite `ENABLE_CODE_EXECUTION=false` — feature gate bypassed
    High · 8.8 CVE-2026-45672 < 0.8.12 0.8.12
  33. Open WebUI: shared-chat branch ignores access_type, allowing unauthorized file deletion
    High · 8.0 CVE-2026-45671 < 0.9.0 0.9.0
  34. Open WebUI: Cross-User File Access via Unchecked file_id in Folder Knowledge and Knowledge-Base Attach Endpoints
    High · 8.1 CVE-2026-45402 < 0.9.5 0.9.5
  35. Open WebUI vulnerable to stored XSS via OAuth picture claim stored as SVG data URI in profile_image_url
    High · 7.3 CVE-2026-56398 < 0.9.5 0.9.5
  36. Open WebUI has a SSRF Bypass via HTTP Redirect Following in Web-Fetch and Image-Load Endpoints (not addressed by CVE-2025-65958)
    High · 8.5 CVE-2026-45401 < 0.9.5 0.9.5
  37. Open WebUI has a Server-Side Request Forgery (SSRF) bypass in `validate_url`
    High · 8.5 CVE-2026-45400 < 0.9.5 0.9.5
  38. Open WebUI: Low-privilege authenticated users can enumerate and stop global background tasks, causing system-wide chat disruption
    High · 7.1 CVE-2026-45399 < 0.9.0 0.9.0
  39. Open WebUI Vulnerable to IDOR: Retrieval API Bypasses Knowledge Base Access Controls
    High · 7.5 CVE-2026-45398 < 0.9.5 0.9.5
  40. Open WebUI's chat completion API allows tool restrictions to be bypassed
    High · 7.1 CVE-2026-45350 < 0.8.6 0.8.6
  41. Open WebUI has Broken Access Control for Completions API
    High · 7.1 CVE-2026-45349 < 0.9.0 0.9.0
Show more (20) Showing 41 of 78

Know which vulnerabilities affect your application

With the DockRay integration and software inventory enabled, DockRay checks reported component versions against known vulnerabilities and notifies you about confirmed matches. Coverage depends on the supported technology and available advisory data.

Connect your application
DockRay newsletter

Application security in your inbox

Important vulnerabilities, actionable guidance and practical advice for your applications. Choose your technologies and follow what matters to your project.

  • A daily digest of new vulnerabilities, critical ones included.
  • Notifications about important updates.
  • Practical advice on application security and monitoring.

Leave empty to receive updates for every technology.

Privacy policy

Free to subscribe. Unsubscribe with one click in any email.