CVEvulnerability

CVE-2026-45315

8.7 HIGH Published 2026-05-15 Modified 2026-06-17 Official page ↗
Status
Modified
Published
2026-05-15
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
8.7 HIGH — CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
Weaknesses
CWE-434, CWE-646, CWE-79

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 configurations

• openwebui open webui (< 0.9.3)

Related

Weakness · CWE (3)

  • CWE-434 Unrestricted Upload of File with Dangerous Type weakness
  • CWE-646 Reliance on File Name or Extension of Externally-Supplied File weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation weakness

References