Open WebUI Windows installer generates low-entropy master key
The Open WebUI Windows installer uses only the installation second as entropy for its master secret key that signs session tokens.
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Vulnerability1 · 1 read
CVE-2025-15603
- CVSS
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- EPSS
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- Published
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- Modified
Description · NVD
Rejected reason: ** REJECT ** DO NOT USE THIS CANDIDATE NUMBER. ConsultIDs: none. Reason: This candidate was withdrawn by its CNA. Further investigation showed that it was not a security issue. Notes: The vendor explains: "The 't0p-s3cr3t' default was dead code on every supported startup path: start.sh, start_windows.bat and `open-webui serve` all set or auto-generate WEBUI_SECRET_KEY before the backend imports env.py. It was only ever reachable by invoking uvicorn directly, which is unsupported and unsafe (the app would then sign tokens/cookies with a public, hardcoded key)."