CVE-2026-70494

Open WebUI vulnerability CVE-2026-70494 affects versions 0.10.0–0.11.0 where the DELETE /api/v1/folders/{id} handler allowed a collaborator with write access to a shared folder to permanently delete chats/messages of the folder owner. The issue arises because the subfolder check accepted any inhe...

CVE-2026-70492

Open WebUI had a stored XSS vulnerability in KaTeX render-fallback: between 0.10.0 and 0.11.0, KaTeX errors could be rendered via HTML (via {@html}) in rendered messages, allowing script execution in viewers’ browsers and risking session token theft and potential admin account takeovers. Affected...

CVE-2026-87997

Open WebUI (self-hosted AI platform) versions 0.10.0 through 0.11.1 contain an access-control bypass in POST /api/chat/completions and POST /api/v1/chat/completions (backend/open_webui/main.py). A client-supplied folder_id was copied into a new chat without the folder write-access check enforced ...

CVE-2026-87013

Open WebUI versions 0.10.0 through 0.11.1 contain a denial-of-service vulnerability in the folder tree functionality. The POST /api/v1/folders/{id}/update/parent endpoint allowed an authenticated user to place a folder under itself or one of its descendants, creating a parent cycle . Because the ...

CVE-2026-87998

Open WebUI (versions 0.10.0 through 0.11.1 ) contains an authorization flaw in the knowledge base deletion endpoint (DELETE /api/v1/knowledge/{id}/delete in backend/open_webui/routers/knowledge.py). The endpoint validates permissions against the knowledge base itself but then removes the associat...

CVE-2026-88000

Open WebUI (a self-hosted AI platform) versions 0.10.0 through 0.11.1 contain a denial-of-service vulnerability in the DELETE /api/v1/chats/{id}/messages/{message_id} endpoint. The chat-history deletion helper follows childrenIds without tracking visited message identifiers, so an authenticated u...