CVE WatchSep 10, 2026

CVE-2026-87994

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.9.5 until 0.11.1, the channel branch of chat_co

CVSS

4.3

Medium

EPSS

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KEV

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Exploit Today

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0-100

Published: Sep 9, 2026 · Last modified: Sep 10, 2026 · CWE-639 · CWE-862

EPSS · 30d

Not enough EPSS history yet.

Technical description

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.9.5 until 0.11.1, the channel branch of chat_completion in backend/open_webui/main.py checked channel write access and channel membership for a supplied message_id but did not verify that the calling user authored the targeted message. A channel member could use the chat completions endpoint to replace another member's message while preserving the victim as the stored author, altering the conversation record without gaining access to other channels. This issue is fixed in version 0.11.1.

Official references

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