CVE-2024-12451: 
WordPress vulnerability analysis and mitigation

The HTML5 chat plugin for WordPress contains a Stored Cross-Site Scripting vulnerability (CVE-2024-12451) discovered in all versions up to and including 1.04. The vulnerability was disclosed on January 30, 2025, affecting the plugin's 'HTML5CHAT' shortcode functionality (NVD).

The vulnerability stems from insufficient input sanitization and output escaping on user-supplied attributes in the HTML5CHAT shortcode. The issue has been assigned a CVSS v3.1 base score of 5.4 (Medium) by NIST with a vector string of CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N, while Wordfence assessed it at 6.4 (Medium) with a vector string of CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N. The vulnerability is classified as CWE-79 (Improper Neutralization of Input During Web Page Generation) (NVD).

When exploited, this vulnerability allows authenticated attackers with contributor-level access or higher to inject arbitrary web scripts into pages. These malicious scripts will execute whenever any user accesses the compromised page (NVD).

A patch has been made available to address this vulnerability, as indicated by the reference to the WordPress plugin repository (WordPress Plugin).