CVE-2025-5258 is a stored cross-site scripting vulnerability in the Conference Scheduler WordPress plugin (versions up to 2.5.1). The issue is due to improper neutralization of input in the 'className' parameter, allowing authenticated users with Contributor-level privileges or higher to inject arbitrary web scripts. These scripts execute in the context of users viewing the injected pages, potentially leading to session hijacking or other script-based attacks. The vulnerability has a CVSS 3.1 score of 6.4, reflecting network attack vector, low attack complexity, and limited privileges required. No patch or official fix details are currently available.

An attacker with Contributor-level or higher access can inject persistent malicious scripts into pages via the vulnerable parameter. These scripts execute in the browsers of users who view the compromised pages, potentially leading to information disclosure or user session compromise. The vulnerability does not affect availability and requires authenticated access, limiting the scope of impact. No known exploitation in the wild has been reported.

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 applying manual input sanitization or output escaping as a temporary measure. Monitor for updates from the plugin vendor regarding patches or official mitigations.