CVE-2026-70481: Open WebUI authorization flaw in standard channel messages

# CVE-2026-70481: Open WebUI authorization flaw in standard channel messages

https://gcdradar.vercel.app/incidents/cve-2026-70481-open-webui-authorization-flaw-in-standard-cha · AIR-2026-0055 · 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-2026-70481
- CVSS: 5.4

## Summary

Standard channel message update and delete handlers in Open WebUI omitted authorship verification, letting ordinary participants modify others' posts. This vulnerability was fixed 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-2026-70481: Open WebUI: Any member with write access to a standard channel can edit or delete other members' messages (https://github.com/advisories/GHSA-mj5r-jf49-m3w7)
- 2026-08-04: CVE-2026-70481: Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. (https://nvd.nist.gov/vuln/detail/CVE-2026-70481)

## Sources

- 2026-08-04 NVD: CVE-2026-70481: Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. https://nvd.nist.gov/vuln/detail/CVE-2026-70481
- 2026-08-04 GitHub Advisory Database: CVE-2026-70481: Open WebUI: Any member with write access to a standard channel can edit or delete other members' messages https://github.com/advisories/GHSA-mj5r-jf49-m3w7

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