What’s Vulnerable › Vulnerabilities

CVE-2026-107751: Mang Board <= 2.4.3 - Unauthenticated Stored Cross-Site Scripting via 'user_name' Parameter

• Severity: high (CVSS 7.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-14 · updated 2026-10-15
• Weakness: CWE-79

Description

The Mang Board plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'user_name' parameter in all versions up to, and including, 2.4.3 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The save-time sanitizer mbw_htmlspecialchars2() is ineffective against this vector because the exploit payload relies solely on unquoted HTML attribute syntax using only spaces, alphanumerics, and characters such as =, parentheses, and dots — none of which are escaped.

Affected products

• kitae-park Mang Board: through 2.4.3

References

• https://plugins.trac.wordpress.org/browser/mangboard/tags/2.4.3/api/mb-board.php#L24
• https://plugins.trac.wordpress.org/browser/mangboard/tags/2.4.3/includes/functions/func.api.php#L146
• https://plugins.trac.wordpress.org/browser/mangboard/tags/2.4.3/includes/mb-actions.php#L520
• https://plugins.trac.wordpress.org/browser/mangboard/tags/2.4.3/includes/skin-filters.php#L50
• https://plugins.trac.wordpress.org/browser/mangboard/tags/2.4.3/templates/tpl.button.php#L75
• https://plugins.trac.wordpress.org/changeset/3738898/mangboard/trunk/templates/tpl.button.php
• https://wordpress.org/plugins/mangboard/
• https://www.wordfence.com/threat-intel/vulnerabilities/id/72650c92-918a-4486-9365-11bcb6b6741a?source=cve

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