The Rank Math SEO WordPress plugin suffers from a stored cross-site scripting vulnerability (CWE-79) in its Rank Math API. This vulnerability arises from improper neutralization of user-supplied input during web page generation, allowing authenticated users with contributor-level privileges or above to inject arbitrary JavaScript code. The injected scripts execute in the context of users who access the compromised pages, potentially leading to session hijacking or other client-side attacks. The issue affects all plugin versions up to 1.0.235. The CVSS 3.1 base score is 6.4, reflecting a network attack vector with low attack complexity, requiring privileges, no user interaction, and impacts confidentiality and integrity with no availability impact. No official patch or remediation guidance is currently available.

An attacker with contributor-level or higher access can inject persistent malicious scripts into pages via the Rank Math API. These scripts execute in the browsers of users who view the infected pages, potentially compromising user sessions or data confidentiality and integrity. The vulnerability does not affect availability. No known active exploitation has been reported.

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 monitoring for suspicious script injections in the plugin's managed content. Avoid exposing sensitive accounts to this plugin until a patch is released.