Vulnerability in Open WebUI's Chat Completion API Allows Unauthorized Access
CVE-2026-45350

7.1HIGH

Key Information:

Vendor

Open-webui

Status
Open-webui
Vendor
CVE Published:
15 May 2026

What is CVE-2026-45350?

Open WebUI, a self-hosted AI platform, has a vulnerability in its chat completion API that allows attackers to bypass tool restrictions. This issue arises because user-supplied parameters, including tool_ids and tool_servers, are not properly validated. As a result, unauthorized users can invoke server tools by providing the correct identifiers, leveraging stored authentication tokens to gain tool privileges. The vulnerability has been addressed in version 0.8.6.

Affected Version(s)

open-webui < 0.8.6

References

https://github.com/open-webui/open-webui/security/advisor...
x_refsource_CONFIRM

CVSS V3.1

Score:
7.1
Severity:
HIGH
Confidentiality:
High
Integrity:
Low
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.