Is Reverse Image Search safe?

Reverse Image Search exposes a web-accessible page that accepts form-submit commands via postMessage from any web origin.

The extension includes post-form.html, listed in web_accessible_resources with matches: ['<all_urls>'], which can be loaded in an iframe by any website. The page listens for postMessage events without checking the sender's origin and, on receiving a SUBMIT_POST_FORM message, creates and submits an HTTP POST form to a caller-supplied URL with caller-supplied field data. No user data is sent to external servers by the extension itself; the risk is that an arbitrary web page can trigger a credentialed form POST to any target URL through this page.

Part of this rating comes from analysis signals we haven't published as detailed findings yet.