Insufficient Session Expiration Affecting open-webui package, versions [,0.3.33)
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.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applications- Snyk IDSNYK-PYTHON-OPENWEBUI-16691311
- published14 May 2026
- disclosed11 May 2026
- credit@Kwstubbs (Kevin Stubbings).
Introduced: 11 May 2026
CVE-2026-56400 (opens in a new tab)How to fix?
Upgrade open-webui to version 0.3.33 or higher.
Overview
open-webui is an Open WebUI
Affected versions of this package are vulnerable to Insufficient Session Expiration via misconfiguration of the CORSMiddleware module and improper session management. An attacker can gain unauthorized access and execute arbitrary code by enticing an authenticated administrator to interact with a malicious website, which leverages cross-origin requests to the application. This can result in full compromise of the container when the application is running with elevated privileges. Session cookies are not invalidated upon logout, allowing attackers with access to previous session details to reuse them for unauthorized access.