The ForumWP – Forum & Discussion Board plugin for WordPress suffers from a stored cross-site scripting vulnerability (CWE-79) due to improper neutralization of input during web page generation. Specifically, the User's Display Name is not properly sanitized or escaped before being rendered, enabling authenticated users with at least Subscriber privileges to inject arbitrary JavaScript code. This malicious code executes in the context of other users visiting the injected pages, potentially leading to session hijacking or other client-side attacks. The vulnerability affects all plugin versions up to 2.1.6. The CVSS 3.1 base score is 6.4, reflecting network attack vector, low attack complexity, required privileges, no user interaction, and impacts on confidentiality and integrity but not availability. No patch or official remediation guidance is currently provided by the vendor.

An authenticated attacker with Subscriber-level access or higher can inject persistent malicious scripts via the User's Display Name field. These scripts execute in the browsers of users who view the affected pages, potentially compromising user sessions or data confidentiality and integrity. The vulnerability does not impact system availability. There are no known active 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 available, consider restricting user input to trusted users only or applying manual input sanitization and output escaping as a temporary mitigation. Monitor vendor channels for updates and apply patches promptly once released.