Open WebUI: Cross-channel message overwrite via chat completion API (single-model and multimodel message_ids)

SummaryAny authenticated user can overwrite the content of a message in a channel they do not belong to including private and DM channels by sending a chat completion request with a channel:-prefixed chatid and a target messageid. The channel: path routes pipeline output through makechannelemitte...

PYSEC-2026-2700 Open WebUI's chat completion API allows tool restrictions to be bypassed

Summary Open WebUI v0.6.43 contains a vulnerability in its chat completion API, which allows attackers to bypass tool restrictions, potentially enabling unauthorized actions or access. Details In the chatcompletion API, the parameters toolids and toolservers are supplied by the user. These...

EUVD-2026-30652

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.8.6, there is a vulnerability in chat completion API, which allows attackers to bypass tool restrictions, potentially enabling unauthorized actions or access. In the chatcompletion API, t...

Open WebUI 安全漏洞

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted WebUI under open source. Versions of Open WebUI prior to 0.8.6 contained security vulnerabilities. These vulnerabilities stemmed from the chat completion API, where tool IDs and server parameters were provided by users witho...

Open WebUI's chat completion API allows tool restrictions to be bypassed

Summary Open WebUI v0.6.43 contains a vulnerability in its chat completion API, which allows attackers to bypass tool restrictions, potentially enabling unauthorized actions or access. Details In the chatcompletion API, the parameters toolids and toolservers are supplied by the user. These...

PT-2026-41180

Name of the Vulnerable Software and Affected Versions Open WebUI versions prior to 0.8.6 Description A flaw in the chat completion API allows users to bypass tool restrictions, potentially leading to unauthorized actions or access. In the '/api/chat/completions' endpoint, the tool ids and tool...

PT-2026-2109

Name of the Vulnerable Software and Affected Versions llama.cpp versions prior to commit 55d4206c9 Description llama.cpp is an inference engine for several Large Language Models LLMs implemented in C/C++. The software parses the n discard parameter directly from JSON input in its completion...