Cross-Site Scripting in Open WebUI AI Platform
CVE-2026-54011

8.7HIGH

Key Information:

Vendor

Open-webui

Status
Open-webui
Vendor
CVE Published:
23 June 2026

What is CVE-2026-54011?

Open WebUI, a self-hosted AI platform, introduces a security concern where user-controlled content can be rendered in an unsafe manner. Versions prior to 0.9.6 leverage Mermaid for rendering Markdown previews, wherein insecure configurations permit attackers to inject malicious scripts. This vulnerability allows an attacker to execute arbitrary JavaScript code in the context of the victim's browser, posing significant security risks, especially for users interacting with the file preview feature.

Affected Version(s)

open-webui < 0.9.6

References

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

CVSS V3.1

Score:
8.7
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
Required
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.