Permissive Cross-domain Security Policy with Untrusted Domains vulnerability in Drupal Next.Js allows Cross-Site Scripting (XSS).This issue affects Next.Js: from 0.0.0 before 1.6.4, from 2.0.0 before 2.0.1.
Weakness
The product uses a web-client protection mechanism such as a Content Security Policy (CSP) or cross-domain policy file, but the policy includes untrusted domains with which the web client is allowed to communicate.
Extended Description
If a cross-domain policy file includes domains that should not be trusted, such as when using wildcards under a high-level domain, then the application could be attacked by these untrusted domains. In many cases, the attack can be launched without the victim even being aware of it.