Reliance on File Name or Extension of Externally-Supplied File Affecting open-webui package, versions [,0.9.3)
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
- creditmaloleg
Introduced: 14 May 2026
NewCVE-2026-45315 (opens in a new tab)How to fix?
Upgrade open-webui to version 0.9.3 or higher.
Overview
open-webui is an Open WebUI
Affected versions of this package are vulnerable to Reliance on File Name or Extension of Externally-Supplied File via the audio transcription upload process. An attacker can execute arbitrary JavaScript in the context of another user's session by uploading a specially crafted file with a malicious extension and tricking a victim into accessing the resulting URL. This can lead to theft of session tokens and full account takeover. This is only exploitable if the chat.stt permission is enabled for the attacker.
Workaround
This vulnerability can be mitigated by setting USER_PERMISSIONS_CHAT_STT=False to revoke the upload right from non-admins.