CVE-2026-45315: Open WebUI stored XSS via audio transcription uploads

# CVE-2026-45315: Open WebUI stored XSS via audio transcription uploads

https://gcdradar.vercel.app/incidents/cve-2026-45315-open-webui-stored-xss-via-audio-transcription · AIR-2026-0671 · closed 2026-05-14

- Lane: Patch now
- Severity: 2 (Disclosed vulnerability)
- Fix status: Fix status unknown
- First reported: 2026-05-14
- AI role: Attack on AI
- Products: Open WebUI
- CVE ids: CVE-2026-45315
- CVSS: 8.7

## Summary

Open WebUI improperly handles file extensions during audio transcription uploads, permitting the storage of polyglot files. Authenticated users can exploit this to execute stored cross-site scripting against other users.

## What to do

No action recorded; read the sources below and the vendor's advisory.

## Latest updates

- 2026-05-15: CVE-2026-45315: Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. (https://nvd.nist.gov/vuln/detail/CVE-2026-45315)
- 2026-05-14: CVE-2026-45315: Open WebUI has stored XSS via attacker-controlled file extension in /api/v1/audio/transcriptions (https://github.com/advisories/GHSA-m8f9-9whg-f4xr)

## Sources

- 2026-05-14 GitHub Advisory Database: CVE-2026-45315: Open WebUI has stored XSS via attacker-controlled file extension in /api/v1/audio/transcriptions https://github.com/advisories/GHSA-m8f9-9whg-f4xr
- 2026-05-15 NVD: CVE-2026-45315: Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. https://nvd.nist.gov/vuln/detail/CVE-2026-45315

Verify against the vendor's advisory before changing production. Data CC BY-SA 4.0, https://gcdradar.vercel.app.