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How the CVE Works:
CVE-2025-46239 is a stored XSS vulnerability in Theme Switcha (versions ≤3.4) where malicious JavaScript payloads persist in the database. The plugin fails to sanitize user-controlled input during theme switching operations. Attackers can inject arbitrary scripts through crafted requests that get executed when admin views the settings page. The vulnerability stems from improper neutralization of input during web page generation, allowing persistent script execution in the context of the admin panel.
DailyCVE Form:
Platform: WordPress
Version: ≤3.4
Vulnerability: Stored XSS
Severity: Medium
Date: 04/29/2025
What Undercode Say:
Analytics:
- Attack Vector: Web-based
- Complexity: Low
- Privileges Required: Contributor+
- User Interaction: Required
- Scope: Changed
- Impact: Moderate
- Exploitability: High
Exploit Commands:
fetch('/wp-admin/admin-ajax.php', {
method: 'POST',
body: 'action=theme_switcha_save&theme=<script>alert(document.cookie)</script>'
});
Detection Code:
// Check for unsanitized theme parameter
if (isset($_POST['theme']) && preg_match('/<script>/i', $_POST['theme'])) {
// Vulnerable instance detected
}
Protection Measures:
// Sanitization fix example
function sanitize_theme_input($theme) {
return sanitize_text_field(strip_tags($theme));
}
add_filter('theme_switcha_theme_input', 'sanitize_theme_input');
Mitigation Steps:
1. Update to Theme Switcha 3.5+
2. Implement CSP headers
3. Sanitize all theme parameter inputs
4. Validate theme names against whitelist
5. Escape output with esc_html()
WAF Rules:
SecRule ARGS_POST:theme "@rx <script>" \ "id:10046239,\ phase:2,\ deny,\ msg:'CVE-2025-46239 Exploit Attempt'"
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
