The Alert Box Block plugin for WordPress suffers from a stored cross-site scripting vulnerability (CWE-79) because it does not properly sanitize or escape user input in its Alert Box block. This allows authenticated users with contributor or higher privileges to inject malicious scripts into pages, which execute in the context of any user viewing those pages. The vulnerability affects all plugin versions up to 1.1.3. The CVSS 3.1 base score is 6.4, reflecting network attack vector, low attack complexity, required privileges at the contributor level, no user interaction, and impacts on confidentiality and integrity but not availability.

An attacker with contributor-level access or higher can inject and store malicious scripts that execute in the browsers of users who view the compromised pages. This can lead to unauthorized actions performed on behalf of users, data theft, or session hijacking. The impact affects confidentiality and integrity but does not affect availability. There are no known exploits in the wild at this time.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, restrict contributor-level access to trusted users only and consider disabling or removing the vulnerable Alert Box Block plugin to prevent exploitation.