CVE-2026-70484: Open WebUI permission check bypass in legacy chat completions

# CVE-2026-70484: Open WebUI permission check bypass in legacy chat completions

https://gcdradar.vercel.app/incidents/cve-2026-70484-open-webui-permission-check-bypass-in-legacy · AIR-2026-0054 · closed 2026-08-04

- Lane: Patch now
- Severity: 2 (Disclosed vulnerability)
- Fix status: Fix status unknown
- First reported: 2026-08-04
- AI role: Attack on AI
- Products: Open WebUI
- CVE ids: CVE-2026-70484
- CVSS: 4.3

## Summary

Open WebUI failed to re-check user permissions for image generation in legacy chat-completions, allowing revoked users to consume provider quotas. A patch was released in version 0.11.0.

## What to do

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

## Latest updates

- 2026-08-04: CVE-2026-70484: Open WebUI: Users denied the image-generation permission can still generate images via chat completions (https://github.com/advisories/GHSA-g423-grf7-98rv)
- 2026-08-04: CVE-2026-70484: Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. (https://nvd.nist.gov/vuln/detail/CVE-2026-70484)

## Sources

- 2026-08-04 NVD: CVE-2026-70484: Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. https://nvd.nist.gov/vuln/detail/CVE-2026-70484
- 2026-08-04 GitHub Advisory Database: CVE-2026-70484: Open WebUI: Users denied the image-generation permission can still generate images via chat completions https://github.com/advisories/GHSA-g423-grf7-98rv

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