Open WebUI thread ID binding flaw discloses private channel messages

# Open WebUI thread ID binding flaw discloses private channel messages

https://gcdradar.vercel.app/incidents/open-webui-thread-id-binding-flaw-discloses-private-channel · AIR-2026-0869 · closed 2026-07-09

- Lane: Patch now
- Severity: 2 (Disclosed vulnerability)
- Fix status: Fix status unknown
- First reported: 2026-07-09 (happened 2026-07-24)
- AI role: Attack on AI
- Products: Open WebUI
- CVE ids: CVE-2026-59215
- CVSS: 3.1

## Summary

An authentication bypass vulnerability in Open WebUI allows normal users to read private channel messages via cross-channel thread parent ID binding. A patch or advisory was issued to address the unauthorized data access.

## What to do

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

## Latest updates

- 2026-07-24: CVE-2026-59215: Open WebUI: Private channel messages can be disclosed through cross-channel thread parent_id binding (https://github.com/advisories/GHSA-73x5-h92w-xc2j)
- 2026-07-09: CVE-2026-59215: Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. (https://nvd.nist.gov/vuln/detail/CVE-2026-59215)

## Sources

- 2026-07-09 NVD: CVE-2026-59215: Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. https://nvd.nist.gov/vuln/detail/CVE-2026-59215
- 2026-07-24 GitHub Advisory Database: CVE-2026-59215: Open WebUI: Private channel messages can be disclosed through cross-channel thread parent_id binding https://github.com/advisories/GHSA-73x5-h92w-xc2j

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