CVE-2026-54009: Open WebUI Cross-User File Disclosure Vulnerability

# CVE-2026-54009: Open WebUI Cross-User File Disclosure Vulnerability

https://gcdradar.vercel.app/incidents/cve-2026-54009-open-webui-cross-user-file-disclosure-vulnera · AIR-2026-0771 · closed 2026-06-17

- Lane: Patch now
- Severity: 2 (Disclosed vulnerability)
- Fix status: Fix status unknown
- First reported: 2026-06-17
- AI role: Attack on AI
- Products: Open WebUI
- CVE ids: CVE-2026-54009
- CVSS: 6.5

## Summary

A cross-user file disclosure flaw in Open WebUI lets authenticated users read arbitrary files belonging to other users through chat completion image references. The issue is covered by a security advisory.

## What to do

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

## Latest updates

- 2026-06-23: CVE-2026-54009: Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. (https://nvd.nist.gov/vuln/detail/CVE-2026-54009)
- 2026-06-17: CVE-2026-54009: Open WebUI: Cross-user file disclosure via /api/chat/completions image_url field (https://github.com/advisories/GHSA-wch8-mhj5-9frg)

## Sources

- 2026-06-17 GitHub Advisory Database: CVE-2026-54009: Open WebUI: Cross-user file disclosure via /api/chat/completions image_url field https://github.com/advisories/GHSA-wch8-mhj5-9frg
- 2026-06-23 NVD: CVE-2026-54009: Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. https://nvd.nist.gov/vuln/detail/CVE-2026-54009

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