CVE-2024-12451: HTML5 chat <= 1.04 - Authenticated (Contributor+) Stored Cross-Site Scripting
Description
The HTML5 chat plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's 'HTML5CHAT' shortcode in all versions up to, and including, 1.04 due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
Classification
CVE ID: CVE-2024-12451
CVSS Base Severity: MEDIUM
CVSS Base Score: 6.4
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Affected Products
Vendor: proxymis
Product: HTML5 chat
Exploit Prediction Scoring System (EPSS)
EPSS Score: 0.05% (probability of being exploited)
EPSS Percentile: 16.62% (scored less or equal to compared to others)
EPSS Date: 2025-02-28 (when was this score calculated)
References
https://www.wordfence.com/threat-intel/vulnerabilities/id/98de0a50-8464-4ea6-bf55-add9aab2d716?source=cvehttps://plugins.trac.wordpress.org/browser/html5-chat/trunk/index.php#L159