CVE-2025-5923 is a stored cross-site scripting vulnerability in the marcdk Game Review Block WordPress plugin affecting versions up to 4.8.1. The issue is due to improper neutralization of input in the ‘className’ parameter, allowing authenticated users with Contributor or higher privileges to inject arbitrary web scripts. These scripts execute when any user accesses the injected page, potentially leading to information disclosure or session hijacking. The vulnerability has a CVSS 3.1 base score of 6.4, reflecting a medium severity with network attack vector, low attack complexity, and requiring privileges. No patch or official remediation details are currently available.

An attacker with Contributor-level or higher access can inject persistent malicious scripts into pages via the vulnerable parameter. This can lead to execution of arbitrary scripts in the context of users viewing the affected pages, potentially resulting in information disclosure or user session compromise. There is no indication of impact to system availability. No known exploits have been reported 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 Game Review Block plugin if feasible. Monitor vendor channels for updates and apply patches promptly once available.