🛡️ CVE-2026-45315
🟠 CVSS 8.7 — High ✅ No Known Exploit CWE-434 NVD
8.7
CVSS Score
0 Low4 Medium7 High9 Critical10

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 runs in the Open WebUI origin. This vulnerability is fixed in 0.9.3.

Details

Severity HIGH
CVSS Score 8.7
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
CWE CWE-434
Public Exploit ✅ No
Source NVD
Published 2026-05-14
Updated 2026-06-15
Modified 2026-06-02
Fix URL N/A

Affected Packages

Software From version Fixed in
open-webui — 0.9.3
unknown — —

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