CVE-2024-13399 is a stored cross-site scripting vulnerability in the Gosign – Posts Slider Block WordPress plugin, affecting all versions up to and including 1.1.0. The vulnerability results from improper neutralization of input during web page generation (CWE-79), allowing authenticated users with Contributor or higher privileges to inject arbitrary scripts via the 'posts-slider-block' block. These scripts execute in the context of users viewing the injected pages, potentially leading to information disclosure or session hijacking. The CVSS 3.1 base score is 6.4, reflecting a network attack vector with low attack complexity, requiring privileges but no user interaction, and impacting confidentiality and integrity.

An attacker with Contributor-level or higher access can exploit this vulnerability to inject malicious scripts that execute in other users' browsers when they access the compromised pages. This can lead to unauthorized actions such as theft of sensitive information or session tokens. The impact affects confidentiality and integrity but 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 released, restrict Contributor-level access to trusted users only and consider disabling or removing the Gosign – Posts Slider Block plugin if feasible. Monitor for updates from the vendor and apply patches promptly once available.