Netsparker identified possible phishing by navigating browser tabs but was unable to confirm the vulnerability.
Open windows with normal hrefs with the tag
target="_blank" can modify window.opener.location and replace the parent webpage with something else, even on a different origin.
While this vulnerability doesn't allow script execution, it does allow phishing attacks that silently replace the parent tab. If the links lack
rel="noopener noreferrer" attribute, a third party site can change the URL of the source tab using window.opener.location.assign and trick the users into thinking that they’re still in a trusted page and lead them to enter their sensitive data on the malicious website.
rel=noopenerto the links to prevent pages from abusing window.opener. This ensures that the page cannot access the window.opener property in Chrome and Opera browsers.
rel=noreferrerwhich additionally disables the Referer header.
<a href="..." target="_blank" rel="noopener noreferrer">...</a>