CVE-2026-2384 in Quiz Maker Plugin
Summary
by MITRE • 02/20/2026
The Quiz Maker plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's `vc_quizmaker` shortcode in all versions up to, and including, 6.7.1.7 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. Note: This vulnerability requires WPBakery Page Builder to be installed and active
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Analysis
by VulDB Data Team • 02/22/2026
The vulnerability identified as CVE-2026-2384 affects the Quiz Maker plugin for WordPress, specifically targeting versions up to and including 6.7.1.7. This issue represents a critical security flaw that enables stored cross-site scripting attacks through the plugin's vc_quizmaker shortcode functionality. The vulnerability is particularly concerning because it requires only contributor-level access or higher, making it accessible to users who should normally have limited privileges within a WordPress environment. The attack vector leverages the WPBakery Page Builder plugin, which must be installed and active for the exploit to function properly, indicating that the vulnerability is not standalone but rather depends on additional plugin components.
The technical flaw stems from insufficient input sanitization and output escaping mechanisms within the plugin's handling of user-supplied attributes in the vc_quizmaker shortcode. When authenticated attackers with contributor-level privileges or higher create or modify content using this shortcode, they can inject malicious JavaScript code that gets stored within the WordPress database. This stored payload remains persistent until explicitly removed, making it a true stored XSS vulnerability rather than a reflected one. The vulnerability manifests when legitimate users access pages containing the injected content, causing the malicious scripts to execute in their browsers within the context of the vulnerable WordPress installation. This behavior aligns with CWE-79, which defines cross-site scripting as a weakness where untrusted data is sent to a web browser without proper validation or escaping.
The operational impact of this vulnerability is significant for WordPress sites utilizing the Quiz Maker plugin with WPBakery Page Builder. Attackers can potentially execute arbitrary code on behalf of authenticated users, which could lead to session hijacking, data theft, privilege escalation, or even complete compromise of the affected WordPress installation. The vulnerability affects all users who can access the shortcode functionality, which in many cases includes contributors, authors, and editors who may not fully understand the security implications of their content creation activities. The stored nature of the vulnerability means that the malicious scripts persist even after the initial injection, making detection and remediation more challenging. This type of vulnerability also aligns with ATT&CK technique T1566, which covers social engineering through malicious content injection, and T1059, which addresses execution through scripting.
Mitigation strategies for CVE-2026-2384 should focus on immediate remediation through plugin updates to versions that address the input sanitization and output escaping deficiencies. Administrators should ensure that all users with contributor-level access or higher are properly vetted and that appropriate security measures are in place to monitor content creation activities. The vulnerability can be partially mitigated by disabling the vc_quizmaker shortcode functionality if it is not essential for operations, or by implementing additional input validation at the WordPress level. Regular security audits of plugins and themes should be conducted to identify similar vulnerabilities, and administrators should maintain updated security monitoring tools to detect potential exploitation attempts. Organizations should also consider implementing content security policies and regular security scanning to identify other potential XSS vulnerabilities within their WordPress installations. The vulnerability demonstrates the importance of proper input validation and output escaping practices as outlined in OWASP top ten security principles and reinforces the need for comprehensive security testing of all user-input handling components within web applications.