CVE-2026-54014: Open WebUI sibling-prefix path traversal in cache endpoint

# CVE-2026-54014: Open WebUI sibling-prefix path traversal in cache endpoint

https://gcdradar.vercel.app/incidents/cve-2026-54014-open-webui-sibling-prefix-path-traversal-in-c · AIR-2026-0767 · 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-2026-54014
- CVSS: 4.3

## Summary

An incomplete containment check in Open WebUI's cache file serving endpoint allows authenticated users to read files from sibling directories. A security advisory and patch have been released.

## What to do

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

## Latest updates

- 2026-06-23: CVE-2026-54014: Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. (https://nvd.nist.gov/vuln/detail/CVE-2026-54014)
- 2026-06-17: CVE-2026-54014: Open WebUI: Sibling-Prefix Path Traversal via /cache/{path} (https://github.com/advisories/GHSA-j2c8-v969-8r5c)

## Sources

- 2026-06-17 GitHub Advisory Database: CVE-2026-54014: Open WebUI: Sibling-Prefix Path Traversal via /cache/{path} https://github.com/advisories/GHSA-j2c8-v969-8r5c
- 2026-06-23 NVD: CVE-2026-54014: Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. https://nvd.nist.gov/vuln/detail/CVE-2026-54014

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