Authorization Bypass Through User-Controlled Key Affecting open-webui package, versions [,0.9.5)
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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- published17 May 2026
- disclosed14 May 2026
- credittenbbughunters, johnatzeropath, LeftenantZero
Introduced: 14 May 2026
NewCVE-2026-45398 (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 in the retrieval process, specifically when validating access to knowledge base collections by UUID. An attacker can access, modify, or delete another user's private knowledge base by supplying a known UUID to the affected API endpoints. This is only exploitable if the attacker is an authenticated user and knows the target knowledge base UUID, which may be leaked through normal platform usage.