Open WebUI Vulnerability in Self-Hosted AI Platform Allows Message Manipulation by Any User
CVE-2026-70481

5.4MEDIUM

Key Information:

Vendor

Open-webui

Status
Open-webui
Vendor
CVE Published:
4 August 2026

What is CVE-2026-70481?

The Open WebUI self-hosted AI platform exposes an access control vulnerability in versions 0.5.0 to 0.10.0. The standard channel message update and delete handlers improperly accept calls from any user with write access, allowing ordinary participants to modify or delete messages authored by others without proper authorization checks. This issue undermines message integrity in shared standard channels. The problem has been addressed in version 0.11.0, reinforcing the need for careful access management within collaborative environments.

Affected Version(s)

open-webui >= 0.5.0, < 0.11.0

References

https://github.com/open-webui/open-webui/security/advisor...
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https://github.com/open-webui/open-webui/pull/27197
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https://github.com/open-webui/open-webui/commit/c609ec411...
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CVSS V3.1

Score:
5.4
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.