CVE-2026-45315
HIGH
MEDIUM
Priority: 0.02
BB Relevance:
57/100
Published: 2026-05-15
Modified: 2026-11-11
First seen: 2026-11-11
Status: active
Attack Surface
Network
Low Complexity
Conf. Impact
Integ. Impact
Scope Change
CVSS Vector Breakdown
AV:
Network
AC:
Low
PR:
Low
UI:
Required
S:
Changed
C:
High
I:
High
A:
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.
Affected Software (1)
| Vendor | Product | Version |
|---|---|---|
| openwebui | open_webui | < 0.9.3 |
References & Advisories (1)
Exploit
Mitigation
Vendor Advisory