CVE-2026-45665

The record

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.8.0, a Stored Cross-Site Scripting (XSS) vulnerability exists in the Banner component due to an improper sanitization order (specifically, DOMPurify is executed before the marked library). This vulnerability allows a compromised or malicious administrator to plant a malicious payload in the global banner. Crucially, this vector enables Privilege Escalation, as the malicious banner is rendered for all users, including the Super Admin (Primary Admin). Consequently, the payload successfully bypasses the existing security mechanism. An attacker can leverage this to steal the Super Admin's session token This vulnerability is fixed in 0.8.0.

Affected packages

Related vulnerabilities

• GHSA-cqp4-qqvg-3787 Open WebUI has Stored XSS in Banner Component via Improper Sanitization Order Same vulnerability
• CVE-2026-45346 Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely… Also affects open-webui
• CVE-2026-45395 Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely… Also affects open-webui
• CVE-2026-44721 Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely… Also affects open-webui
• GHSA-p4fx-23fq-jfg6 Open WebUI: Missing `workspace.tools` Authorization Check on Tool Update Endpoint Allows… Also affects open-webui
• GHSA-r29h-37fj-x2w6 Open WebUI Has Stored Cross-Site Scripting in SVG Renderer Also affects open-webui
• GHSA-gf5m-wcrh-7928 open-webui Vulnerable to Stored XSS via Model Description Also affects open-webui
• GHSA-8wvc-869r-xfqf Open WebUI Vulnerable to Stored DOM XSS via Note 'Download PDF' Also affects open-webui