Authorization Bypass Through User-Controlled Key Affecting open-webui package, versions [0.5.0,0.9.5)
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
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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- published19 May 2026
- disclosed14 May 2026
- creditkikayli
Introduced: 14 May 2026
NewCVE-2026-45385 (opens in a new tab)How to fix?
Upgrade open-webui to version 0.9.5 or higher.
Overview
open-webui is an Open WebUI
Affected versions of this package are vulnerable to Authorization Bypass Through User-Controlled Key through the update_message_by_id and delete_message_by_id handlers in channels.py. An attacker can overwrite or remove another member’s group or direct message content by sending an update or delete request for a message in a channel they belong to. This lets a verified participant tamper with conversation history, impersonate the original author’s message content, and erase messages from other users’ chats.