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CVE-2026-87994

CVE-2026-87994 · Open WebUI: Channel members can overwrite another member's message via the chat completions endpoint

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 4.3 · Medium · EPSS 0.4% · Fix available

Published
Updated

Stack: python

Affected products and versions

  • open-webui

    Versions
    • >= 0.9.5, < 0.11.1: Affected

    No fix published

  • open-webui PyPI

    Versions
    • 0.10.0
    • 0.10.1
    • 0.10.2
    • 0.11.0
    • 0.9.5
    • 0.9.6
    Affected ranges
    • ECOSYSTEM: ≥ 0.9.5, < 0.11.1

    Update to 0.11.1

Original sources

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