CVE-2026-87999: Open WebUI server-side request fetch bypass to internal endpoints

# CVE-2026-87999: Open WebUI server-side request fetch bypass to internal endpoints

https://gcdradar.vercel.app/incidents/cve-2026-87999-open-webui-server-side-request-fetch-bypass-t · AIR-2026-0925 · closed 2026-09-09

- Lane: Patch now
- Severity: 2 (Disclosed vulnerability)
- Fix status: Fix status unknown
- First reported: 2026-09-09 (happened 2026-09-10)
- AI role: Attack on AI
- Products: Open WebUI
- CVE ids: CVE-2026-87999
- CVSS: 7.1

## Summary

A vulnerability in Open WebUI allowed authenticated users to reach internal Azure platform endpoints during RAG URL ingestion due to insufficient IP address checks. The vulnerability has been disclosed via a security advisory.

## What to do

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

## Latest updates

- 2026-09-10: CVE-2026-87999: Open WebUI: Any authenticated user can reach the Azure platform channel via server-side web fetch (https://github.com/advisories/GHSA-34r3-9m95-vq73)
- 2026-09-09: CVE-2026-87999: Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. (https://nvd.nist.gov/vuln/detail/CVE-2026-87999)

## Sources

- 2026-09-09 NVD: CVE-2026-87999: Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. https://nvd.nist.gov/vuln/detail/CVE-2026-87999
- 2026-09-10 GitHub Advisory Database: CVE-2026-87999: Open WebUI: Any authenticated user can reach the Azure platform channel via server-side web fetch https://github.com/advisories/GHSA-34r3-9m95-vq73

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