Unsafe cross-origin links

Opportunity severity, in the Security tab

Why it matters

External links opened in a new tab (target=_blank) without rel=noopener let the target page access window.opener.

How to fix it

Add rel="noopener" (modern browsers default to this for target=_blank, but be explicit).

How Crawlune finds it

Crawlune flags Unsafe cross-origin links automatically on every crawl and lists the affected URLs under the Security tab, where you can filter, inspect each page and export the list to CSV. The free version crawls up to 550 URLs with every check enabled.