CVE-2026-45315
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
open-webuiPyPI | < 0.9.3 | 0.9.3 |
Affected products
2<= 0.9.2+ 1 more
- (no CPE)range: <= 0.9.2
- cpe:2.3:a:openwebui:open_webui:*:*:*:*:*:*:*:*range: <0.9.3
Patches
Vulnerability mechanics
References
4- github.com/open-webui/open-webui/security/advisories/GHSA-m8f9-9whg-f4xrnvdExploitMitigationVendor AdvisoryWEB
- github.com/advisories/GHSA-m8f9-9whg-f4xrghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-45315ghsaADVISORY
- github.com/open-webui/open-webui/releases/tag/v0.9.3ghsaWEB
News mentions
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