Description
Drupal Core is prone to a cross-site scripting vulnerability because it fails to properly sanitize user-supplied input. An attacker may leverage this issue to execute arbitrary script code in the browser of an unsuspecting user in the context of the affected site. This can allow the attacker to steal cookie-based authentication credentials and launch other attacks. Drupal Core versions 8.9.x ranging from 8.9.0 and up to and including 8.9.15 are vulnerable.
Remediation
Update to Drupal Core version 8.9.16 or latest
References
Related Vulnerabilities
Drupal Core 4.6.x Cross-Site Scripting (4.6.0 - 4.6.3)
WordPress Plugin Nextend Google Connect Unspecified Vulnerability (1.5.3)
WordPress Plugin Blue Wrench Video Widget Cross-Site Request Forgery (1.0.5)
WordPress Plugin Side Menu Lite-add sticky fixed buttons SQL Injection (2.2)
WordPress Plugin Flickr Justified Gallery Cross-Site Scripting (3.3.6)