CVE-2026-45350: Open WebUI chat completion API tool restriction bypass

# CVE-2026-45350: Open WebUI chat completion API tool restriction bypass

https://gcdradar.vercel.app/incidents/cve-2026-45350-open-webui-chat-completion-api-tool-restricti · AIR-2026-0656 · 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-2026-45350
- CVSS: 7.1

## Summary

Open WebUI contains a vulnerability in its chat completion API allowing attackers to bypass tool restrictions via user-supplied parameters. This flaw could enable unauthorized tool usage or access.

## What to do

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

## Latest updates

- 2026-05-15: CVE-2026-45350: Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. (https://nvd.nist.gov/vuln/detail/CVE-2026-45350)
- 2026-05-14: CVE-2026-45350: Open WebUI's chat completion API allows tool restrictions to be bypassed (https://github.com/advisories/GHSA-4pcg-253r-rf9w)

## Sources

- 2026-05-14 GitHub Advisory Database: CVE-2026-45350: Open WebUI's chat completion API allows tool restrictions to be bypassed https://github.com/advisories/GHSA-4pcg-253r-rf9w
- 2026-05-15 NVD: CVE-2026-45350: Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. https://nvd.nist.gov/vuln/detail/CVE-2026-45350

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