CVE-2026-54011

HIGH EPSS 10.0%
Published Jun 23, 20261w ago · Modified Jun 23, 20261w ago
8.7 CVSS 3.1
High
Find Similar
Published Jun 23, 2026 1w ago
Last Modified Jun 23, 2026 1w ago

Description

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.6,Open WebUI renders Mermaid blocks from Markdown files in the file preview panel and inserts the generated SVG into the DOM using innerHTML. Because Mermaid is configured with securityLevel: 'loose', attacker-controlled Mermaid content can be rendered unsafely in this flow. A working payload was validated through the Markdown preview path, resulting in JavaScript execution in the victim’s browser under the application origin. This vulnerability is fixed in 0.9.6.

CVSS Details

Base Score
8.7
Exploitability
2.3
Impact
5.8
Vector string
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
Attack Vector Network
Attack Complexity Low
Privileges Required Low
User Interaction Required
Scope Changed
Confidentiality High
Integrity High
Availability None

Threat Intelligence

EPSS Exploit Probability
10.0% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-79 Cross-site Scripting Injection

References 1

  • github.com https://github.com/open-webui/open-webui/security/advisories/GHSA-v8qj-hxv7-mgvv

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.