CVE-2026-45386: Open WebUI IDOR Vulnerability in Message Pinning API

# CVE-2026-45386: Open WebUI IDOR Vulnerability in Message Pinning API

https://gcdradar.vercel.app/incidents/cve-2026-45386-open-webui-idor-vulnerability-in-message-pinn · AIR-2026-0699 · 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-2026-45386
- CVSS: 4.3

## Summary

An insecure direct object reference vulnerability exists within the pin channel message endpoint of Open WebUI. Read-only users can improperly pin or unpin messages in standard channels.

## What to do

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

## Latest updates

- 2026-05-15: CVE-2026-45386: Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. (https://nvd.nist.gov/vuln/detail/CVE-2026-45386)
- 2026-05-14: CVE-2026-45386: Open WebUI has an IDOR vulnerability in the pin_channel_message API endpoint (https://github.com/advisories/GHSA-5gc6-xhv4-2wg6)

## Sources

- 2026-05-14 GitHub Advisory Database: CVE-2026-45386: Open WebUI has an IDOR vulnerability in the pin_channel_message API endpoint https://github.com/advisories/GHSA-5gc6-xhv4-2wg6
- 2026-05-15 NVD: CVE-2026-45386: Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. https://nvd.nist.gov/vuln/detail/CVE-2026-45386

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