Missing Authorization Affecting open-webui package, versions [0.9.5,0.11.1)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published27 Sept 2026
- disclosed10 Sept 2026
- creditUnknown
Introduced: 10 Sep 2026
NewCVE-2026-87994 (opens in a new tab)How to fix?
Upgrade open-webui to version 0.11.1 or higher.
Overview
open-webui is an Open WebUI
Affected versions of this package are vulnerable to Missing Authorization through the chat completions process. An attacker can overwrite another user's message content by submitting a crafted request to the endpoint, causing the original message to be replaced while retaining the victim's authorship. This is only exploitable if channels are enabled (ENABLE_CHANNELS set to true) and the attacker has write access to the target channel and knows the message id, which is accessible to all channel members.