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High

Open WebUI has Broken Access Control for Completions API

  • Disclosed: 14.05.2026
  • Updated: 11.10.2026 14:17

Summary

Any user X can continue the conversation of any other user Y, as long as the Chat ID of Y is known. User X does not even need to be an admin to do so.

Details

A user just needs to use the API endpoint: /api/chat/completions with their own API key (generated in OWUI) and the Chat ID of another user. OWUI does not check to match the Chat ID with the user that created that Chat ID. Note that both users will need access to the same model. This is especially relevant if there is a shared pipeline model between users.

PoC

  1. Using OWUI v0.6.18
  2. Sign in with any user X
  3. Generate an API Key for user X using the settings
  4. Create another user Y, and have a conversation in OWUI. Copy the Chat ID from the URL.
  5. User X can now use the API /api/chat/completions and the Chat ID from step 4 to continue the conversation of user Y

Impact

Large impact to any user in OWUI. People can read your conversations, and access private information if they know your Chat ID (which is in the URL of the chat).

Resolution

Fixed in commit cf4218e68, first released in v0.9.0 (Apr 2026). The chat_completion handler at backend/open_webui/main.py:1868 now explicitly verifies chat ownership via Chats.is_chat_owner(chat_id, user.id) for any request that targets an existing chat, and raises 404 for non-owners (admin bypass preserved per the documented threat model). New chats (no chat_id supplied, or freshly inserted via the is_new_chat branch) are unaffected. Users on >= 0.9.0 are not affected.

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:H/I:L/A:N
Weakness (CWE)
CWE-639
Platform
Python (PyPI)
Package
open-webui
Disclosed
14.05.2026
Updated
11.10.2026 14:17

Sources and licenses

OSV / GitHub Advisory Database - PYSEC-2026-2726 - PyPA Advisory Database; CC BY 4.0

OSV / GitHub Advisory Database - GHSA-gfm2-xm6c-37qc - 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 has Broken Access Control for Completions API this entry
    High · 7.1 CVE-2026-45349 < 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
Show more (20) Showing 21 of 78

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