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POC Details: da9e7ae220339198546485baad7e781df31b439c

Source
https://github.com/projectdiscovery/nuclei-templates/blob/main/http/vulnerabilities/retool/retool-postmessage-xss.yaml
Associated Vulnerability

Likely 0-day

Description
Retool Self-Hosted versions 3.284.0 through 3.284.11 contain a cross-site scripting (XSS) vulnerability in the custom component collections iframe handler. The postMessage event listener in custom-component-collections.html accepts messages from any origin without validation and dynamically imports the received code via data:text/javascript URLs, allowing arbitrary JavaScript execution in the Retool instance origin context.
File Snapshot

 id: retool-postmessage-xss

info:
  name: Retool Self-Hosted - postMessage XSS via Custom Component 

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