The Meta Field Block plugin for WordPress suffers from a stored cross-site scripting vulnerability (CWE-79) due to improper neutralization of input in the 'tagName' block attribute. Authenticated users with contributor or higher privileges can inject arbitrary JavaScript code that executes in the context of other users viewing the compromised pages. This vulnerability affects all versions up to and including 1.5.2. The CVSS 3.1 base score is 6.4, reflecting network attack vector, low attack complexity, privileges required, no user interaction, and impacts on confidentiality and integrity but not availability. No patch or official remediation level has been published by the vendor as of the data provided.

Successful exploitation allows an attacker with contributor-level access or higher to inject persistent malicious scripts into pages. These scripts execute in the browsers of users who view the infected pages, potentially leading to unauthorized disclosure of information or manipulation of page content. The vulnerability does not impact system availability. There are no reported active exploits in the wild.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict contributor-level access to trusted users only and consider additional input validation or content filtering at the application or web server level to mitigate risk.