Improper Restriction of Rendered UI Layers or Frames Affecting open-webui package, versions [0.8.11,0.11.1)
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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Test your applications- Snyk IDSNYK-PYTHON-OPENWEBUI-20158694
- published27 Sept 2026
- disclosed10 Sept 2026
- creditUnknown
Introduced: 10 Sep 2026
NewCVE-2026-87995 (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 Improper Restriction of Rendered UI Layers or Frames in the PortPreview process. An attacker can gain access to session tokens and take over user accounts by serving malicious scripts on a terminal server port and convincing a victim to preview that port within the application. This is only exploitable if at least one terminal server is configured and reachable by both attacker and victim, the attacker has a normal authenticated account with access to the terminal connection, the victim opens the port list and clicks the attacker's port, and default security headers (TERMINAL_PROXY_HEADERS and CONTENT_SECURITY_POLICY) remain unset.