CVE-2026-82284

Quivr versions through 0.0.322 contain a missing ownership validation flaw in three chat API endpoints: GET /chat/{chat_id}/history, DELETE /chat/{chat_id}, and POST /chat/{chat_id}/question/answer. An authenticated attacker can leverage this to read other users' conversation histories (including...

EUVD-2026-67815

Quivr versions through 0.0.322 fail to validate chat ownership in the GET /chat/chatid/history, DELETE /chat/chatid, and POST /chat/chatid/question/answer endpoints. Authenticated attackers can read other users' conversation histories including private knowledge base content, delete arbitrary...

CVE-2026-12510

The AI Engine WordPress plugin before 3.5.5 does not verify that a user owns the chatbot conversation referenced by a client-supplied identifier, allowing users with subscriber-level access to read other users' private conversations and take over their conversation records when the discussions...

PYSEC-2026-2726 Open WebUI has Broken Access Control for Completions API

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 anoth...

GHSA-GFM2-XM6C-37QC Open WebUI has Broken Access Control for Completions API

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 anoth...

Open WebUI has Broken Access Control for Completions API

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 anoth...