CVE-2026-45303

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.6.5, through the HTML rendering view, scripts can be injected and executed. The frontend provides a function to visualize the HTML content of a current chat. The content is embedded in an iFrame with the allow-scripts allow-forms allow-same-origin sandbox directive. This means that the content is placed in a sandbox but with permission to execute scripts and access the parent’s data (e.g., local storage). As a result, only a few functions are restricted (e.g., displaying an alert box), but in effect, the sandbox attribute is largely nullified. This vulnerability is fixed in 0.6.5.

• CWE-79

• https://github.com/open-webui/open-webui/security/advisories/GHSA-4vrc-m9ch-6m3rExploit, Mitigation, Vendor Advisory
• https://github.com/open-webui/open-webui/security/advisories/GHSA-4vrc-m9ch-6m3rExploit, Mitigation, Vendor Advisory

Published

May 15, 2026

Last Modified

Jun 17, 2026

Status

Modified

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