CVE-2025-68502

Executive Summary

CVE-2025-68502 is an Authorization Bypass Through User-Controlled Key vulnerability in the Crocoblock JetPopup WordPress plugin, affecting versions up to and including 2.0.20.1. This vulnerability allows an unauthenticated attacker to bypass access control mechanisms by manipulating user-controlled keys, potentially leading to unauthorized access to sensitive data or functionality. The vulnerability is classified as a WordPress ecosystem issue and is not related to the underlying web server (Apache/Nginx). The CVSS score is 4.3 (Medium), and the EPSS score is 0.0%, indicating low exploitation likelihood in the wild. No public proof-of-concept or exploit code is available at this time.

Supply Chain & Package Security

This vulnerability affects a WordPress plugin distributed via the official WordPress plugin repository and the Crocoblock website. Users are advised to verify the integrity of their plugin installations and monitor for any unauthorized modifications. Since no patch is available, the supply chain risk is elevated for sites using this plugin.

CVSS Breakdown & Threat Level

• CVSS Score: 4.3 (Medium)
• Attack Vector: Network (AV:N)
• Attack Complexity: Low (AC:L)
• Privileges Required: None (PR:N)
• User Interaction: None (UI:N)
• Scope: Unchanged (S:U)
• Confidentiality Impact: Low (C:L)
• Integrity Impact: None (I:N)
• Availability Impact: None (A:N)

The vulnerability allows an attacker to bypass authorization checks by manipulating a user-controlled key (e.g., a post ID or nonce). The low confidentiality impact suggests that only limited data exposure is possible, but the lack of required privileges makes it trivially exploitable.

Deep Dive & Mechanics

The JetPopup plugin uses user-controlled keys (likely $_GET or $_POST parameters) to determine which popup content to display or which actions to perform. The vulnerability lies in the plugin's failure to properly validate that the requesting user has the necessary permissions to access the resource identified by the key.

Root Cause: The plugin does not perform an authorization check (e.g., current_user_can()) before processing the user-supplied key. This allows an unauthenticated attacker to supply arbitrary keys (such as post IDs, user IDs, or option names) and retrieve data that should be restricted.

Attack Vector: An attacker sends a crafted HTTP request to a WordPress site with the JetPopup plugin active, manipulating the key parameter (e.g., popup_id, post_id, or nonce) to access unauthorized resources.

Impact: The attacker can read sensitive information such as draft posts, private pages, user metadata, or plugin settings. In some configurations, this could lead to privilege escalation if the key controls access to administrative functions.

Vulnerable vs. Patched Code

Since no patch is available, the vulnerable code pattern is described below. A patched version would include proper authorization checks.

Vulnerable Code (Conceptual):

// In JetPopup's AJAX handler or shortcode
$popup_id = $_GET['popup_id'];
$popup_data = get_post($popup_id); // No capability check
echo json_encode($popup_data);

Patched Code (Conceptual):

// Patched version
$popup_id = intval($_GET['popup_id']);
if ( ! current_user_can('edit_post', $popup_id) ) {
    wp_die('Unauthorized');
}
$popup_data = get_post($popup_id);
echo json_encode($popup_data);

Exploitation & Lab Setup

Red Team (Exploitation)

Prerequisites:

• A WordPress site with JetPopup <= 2.0.20.1 installed and activated.
• A publicly accessible endpoint that processes user-controlled keys (e.g., AJAX handler or shortcode).

Exploitation Steps:

1. Identify the vulnerable endpoint. Common patterns include:
   • /wp-admin/admin-ajax.php?action=jet_popup_get_content&popup_id=123
   • A shortcode like [jet_popup id="123"]
2. Manipulate the popup_id parameter to access unauthorized posts:

   curl "http://target.com/wp-admin/admin-ajax.php?action=jet_popup_get_content&popup_id=1"
   

3. Iterate through IDs to enumerate private/draft posts:

   for i in {1..100}; do
       curl -s "http://target.com/wp-admin/admin-ajax.php?action=jet_popup_get_content&popup_id=$i"
   done
   

Expected Output: The attacker receives JSON or HTML content of posts they should not have access to.

Blue Team (Defense & Detection)

Detection:

• Monitor for unusual AJAX requests to admin-ajax.php with action=jet_popup_get_content or similar.
• Look for sequential ID enumeration patterns in popup_id parameters.
• Alert on requests from unauthenticated users to endpoints that should require authentication.

Hunting Query (Splunk):

index=web sourcetype=access_combined
uri_path="/wp-admin/admin-ajax.php"
uri_query=*action=jet_popup*
| stats count by clientip, uri_query
| where count > 10

Indicators of Compromise (IOCs)

• Network IOCs:

  • HTTP requests to /wp-admin/admin-ajax.php with action=jet_popup_get_content or similar.
  • Sequential popup_id parameter values in short timeframes.
  • Unauthenticated requests to endpoints that should require authentication.

• File IOCs:

  • Modified plugin files in /wp-content/plugins/jetpopup/ (check file integrity).
  • Unexpected log entries in WordPress debug log (wp-content/debug.log).

• Behavioral IOCs:

  • Unauthorized access to draft or private posts.
  • Unusual data exfiltration patterns from the WordPress database.

Detection Engineering

YARA Rule

rule CVE_2025_68502_JetPopup_AuthBypass {
    meta:
        description = "Detects exploitation attempts of CVE-2025-68502 in JetPopup plugin"
        author = "Valters IT"
        date = "2025-04-01"
        reference = "https://nvd.nist.gov/vuln/detail/CVE-2025-68502"
    strings:
        $ajax_action = "jet_popup_get_content" nocase
        $popup_id_param = "popup_id=" nocase
        $shortcode = "[jet_popup" nocase
    condition:
        any of ($ajax_action, $shortcode) and $popup_id_param
}

Sigma Rule

title: CVE-2025-68502 JetPopup Authorization Bypass
id: 8a9b7c6d-5e4f-3a2b-1c0d-9e8f7a6b5c4d
status: experimental
description: Detects attempts to exploit authorization bypass in JetPopup plugin
author: Valters IT
date: 2025/04/01
logsource:
    category: webserver
    product: apache
    service: access
detection:
    selection:
        cs-uri-query|contains:
            - "action=jet_popup_get_content"
            - "popup_id="
    condition: selection
falsepositives:
    - Legitimate admin usage
level: medium

Suricata Rule

alert http any any -> $EXTERNAL_NET any (
    msg:"CVE-2025-68502 JetPopup Authorization Bypass Attempt";
    flow:to_server,established;
    content:"/wp-admin/admin-ajax.php";
    http_uri;
    content:"action=jet_popup_get_content";
    http_uri;
    content:"popup_id=";
    http_uri;
    classtype:attempted-recon;
    sid:1000001;
    rev:1;
    reference:cve,2025-68502;
)

Remediation & Mitigation

Immediate Actions:

1. Disable the JetPopup plugin until a patch is released by the vendor.
2. If disabling is not possible, implement a Web Application Firewall (WAF) rule to block requests containing action=jet_popup_get_content from unauthenticated users.
3. Restrict access to /wp-admin/admin-ajax.php using .htaccess or server-level rules:

   <Files "admin-ajax.php">
       Require all denied
       Require ip 127.0.0.1
   </Files>
   

   (Note: This may break legitimate AJAX functionality; use with caution.)

Long-Term Fixes:

• Monitor the Crocoblock website and WordPress plugin repository for a security update.
• Apply the patch as soon as it becomes available.
• Conduct a security audit of all WordPress plugins for similar authorization bypass vulnerabilities.

Workaround:

• Implement a custom filter in functions.php to validate the popup_id parameter:

  add_filter('jet-popup/ajax/get-content', function($response, $request) {
      $popup_id = intval($request->get_param('popup_id'));
      if ( ! current_user_can('read', $popup_id) ) {
          return new WP_Error('unauthorized', 'You do not have permission.');
      }
      return $response;
  }, 10, 2);
  

Valters IT
Securing Digital Frontiers