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How CVE-2025-4208 Works
The vulnerability in NEX-Forms plugin (≤8.9.1) stems from improper input sanitization in the `get_table_records` function. Authenticated attackers with Custom-level access can exploit `call_user_func()` to execute arbitrary PHP functions. The attack is constrained to static methods or global functions accepting a single array parameter. User-supplied input is passed directly to call_user_func(), enabling malicious actors to trigger unintended PHP operations, potentially leading to remote code execution (RCE). This flaw leverages WordPress’s role-based access control, requiring attacker authentication but posing critical risk due to possible server compromise.
DailyCVE Form
Platform: WordPress
Version: ≤8.9.1
Vulnerability: Code Execution
Severity: Critical
Date: 2025-06-04
Prediction: Patch by 2025-07-15
What Undercode Say:
Analytics
- Exploit Likelihood: High (public PoC expected)
- Attack Surface: Authenticated users
- Mitigation Complexity: Low (sanitize inputs)
Exploit Commands
// Proof-of-Concept (authenticated) $payload = [ 'function' => 'system', 'param' => ['id'] ]; wp_remote_post($target, ['body' => $payload]);
Protection Code
// Sanitize call_user_func() inputs
if (!in_array($user_input, $allowed_functions)) {
die('Invalid function');
}
WP-CLI Checks
wp plugin list | grep "nex-forms" wp option get nexforms_version
Log Analysis
grep -r "call_user_func" /var/www/html/wp-content/plugins/nex-forms
.htaccess Mitigation
<Files "nex-forms/.php"> Require all denied </Files>
WAF Rules
location ~ /wp-content/plugins/nex-forms/ {
deny all;
}
Patch Verification
curl -s https://plugins.trac.wordpress.org/nex-forms | grep "Fixed: CVE-2025-4208"
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
