CVE-2026-45315
CVE-2026-45315
8.7
HighPublished:
Last updated:
Source:security-advisories@github.com
Modified
CVSS Vector
v3.1- Attack Vector
- Network
- Attack Complexity
- Low
- Privileges Required
- Low
- User Interaction
- Required
- Scope
- Changed
- Confidentiality
- High
- Integrity
- High
- Availability
- None
Description
Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.3, the audio transcription upload endpoint takes the file extension from the user-supplied filename and saves the file under CACHE_DIR/audio/transcriptions/.. The /cache/{path} route serves these files via FileResponse, which sets Content-Type from the on-disk extension and emits no Content-Disposition. A verified user with the default-on chat.stt permission can upload a polyglot WAV+HTML file named pwn.html and trick any other user into opening the resulting URL — the response comes back as text/html and any embedded <script> runs in the Open WebUI origin. This vulnerability is fixed in 0.9.3.
References
security-advisories@github.com
https://github.com/open-webui/open-webui/security/advisories/GHSA-m8f9-9whg-f4xr134c704f-9b21-4f2e-91b3-4a467353bcc0
https://github.com/open-webui/open-webui/security/advisories/GHSA-m8f9-9whg-f4xr