CVE-2025-58816

Executive Summary

CVE-2025-58816 is a Missing Authorization vulnerability (CWE-862) in the Product Carousel Slider for Elementor WordPress plugin, developed by Plugin Devs. This flaw allows an unauthenticated attacker to exploit incorrectly configured access control security levels, potentially leading to unauthorized data exposure or manipulation. The vulnerability affects all versions up to and including 2.1.3. With a CVSS score of 3.5 (Low), the risk is considered minimal but still significant in the context of WordPress ecosystem security, as it can be chained with other vulnerabilities for broader impact. No public proof-of-concept (PoC) or exploit code is currently available, and the patch status remains unknown.

Supply Chain & Package Security

This vulnerability resides in a WordPress plugin distributed via the official WordPress Plugin Directory. As such, it impacts the WordPress ecosystem supply chain. Users are advised to monitor the plugin’s update channel and apply any patches immediately upon release. The absence of a patch at this time underscores the need for defensive measures such as Web Application Firewall (WAF) rules and strict access controls.

CVSS Breakdown & Threat Level

• CVSS Score: 3.5 (Low)
• Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
• Attack Vector: Network
• Attack Complexity: Low
• Privileges Required: None
• User Interaction: None
• Scope: Unchanged
• Confidentiality Impact: None
• Integrity Impact: Low
• Availability Impact: None

The low score reflects the limited direct impact (only integrity is affected), but the lack of authentication requirements makes it exploitable by any remote attacker. In a WordPress context, this could allow unauthorized modification of plugin settings or data, potentially leading to defacement or data injection.

Deep Dive & Mechanics

The vulnerability stems from missing authorization checks in the plugin’s AJAX handlers or REST API endpoints. Specifically, the plugin fails to verify user capabilities before executing sensitive actions, such as updating carousel settings, deleting products, or modifying slider configurations. This allows any unauthenticated visitor to send crafted requests to the WordPress backend and perform actions reserved for administrators.

The affected component is likely the ecommerce-product-carousel-slider-for-elementor plugin’s admin-ajax.php or REST API routes. The plugin uses WordPress’s wp_ajax_ and wp_ajax_nopriv_ hooks, but the latter (for unauthenticated users) should be restricted to non-sensitive actions. In this case, the developer incorrectly configured access control, leaving endpoints open.

Vulnerable vs. Patched Code

Since no patch is available, we can only hypothesize the fix. The vulnerable code likely resembles:

// Vulnerable: No capability check
add_action('wp_ajax_nopriv_update_carousel', 'update_carousel_handler');
function update_carousel_handler() {
    // Process request without checking user capabilities
    update_option('carousel_data', $_POST['data']);
    wp_die();
}

A patched version would include a capability check:

// Patched: Added capability check
add_action('wp_ajax_update_carousel', 'update_carousel_handler');
add_action('wp_ajax_nopriv_update_carousel', 'update_carousel_handler');
function update_carousel_handler() {
    if (!current_user_can('manage_options')) {
        wp_die('Unauthorized', 403);
    }
    // Process request
    update_option('carousel_data', $_POST['data']);
    wp_die();
}

The key difference is the current_user_can('manage_options') check, which ensures only administrators can execute the action.

Exploitation & Lab Setup

Red Team

Since no public exploit exists, a red team would need to reverse-engineer the plugin to identify vulnerable endpoints. Steps:

1. Install the vulnerable plugin (version <= 2.1.3) on a local WordPress instance.
2. Enumerate AJAX actions by inspecting the plugin’s JavaScript or PHP files for wp_ajax_nopriv_ hooks.
3. Craft a request to a vulnerable endpoint, e.g.:

   POST /wp-admin/admin-ajax.php HTTP/1.1
   Host: target.com
   Content-Type: application/x-www-form-urlencoded
   
   action=update_carousel&data=malicious_value
   

4. Verify impact by checking if the action was performed without authentication.

Blue Team

Defenders should:

1. Monitor for unusual AJAX requests to admin-ajax.php with actions related to the plugin.
2. Implement WAF rules to block requests to unknown or suspicious AJAX actions.
3. Audit user roles and ensure no unauthorized users have elevated privileges.
4. Use a WordPress security plugin (e.g., Wordfence) to detect and block exploitation attempts.

Indicators of Compromise (IOCs)

• Network: HTTP POST requests to /wp-admin/admin-ajax.php with action parameters containing plugin-specific strings (e.g., update_carousel, delete_product).
• File: Unauthorized modifications to the wp_options table entries related to the plugin (e.g., carousel_data).
• Log: WordPress debug log entries showing failed capability checks or unexpected AJAX calls.

Detection Engineering

YARA Rule

rule CVE_2025_58816_WordPress_Plugin_Missing_Auth {
    meta:
        description = "Detects missing authorization in Product Carousel Slider for Elementor plugin"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-58816"
    strings:
        $vuln_func = "wp_ajax_nopriv_" nocase
        $plugin_slug = "ecommerce-product-carousel-slider-for-elementor" nocase
    condition:
        $vuln_func and $plugin_slug
}

Sigma Rule

title: CVE-2025-58816 - Missing Authorization in Product Carousel Slider for Elementor
id: 8a4b3c2d-1e5f-4a7b-9c8d-0e1f2a3b4c5d
status: experimental
description: Detects exploitation attempts of missing authorization vulnerability in WordPress plugin
author: Valters IT
date: 2025-04-10
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-method: 'POST'
        cs-uri-query|contains: '/wp-admin/admin-ajax.php'
        cs-uri-query|contains: 'action='
    condition: selection
falsepositives:
    - Legitimate plugin AJAX calls
level: medium

Suricata Rule

alert http any any -> any any (msg:"CVE-2025-58816 - Missing Authorization in Product Carousel Slider for Elementor"; flow:to_server,established; content:"POST"; http_method; content:"/wp-admin/admin-ajax.php"; http_uri; content:"action="; http_client_body; pcre:"/action=(update_carousel|delete_product)/i"; classtype:attempted-admin; sid:1000001; rev:1;)

Remediation & Mitigation

1. Immediate: Disable the plugin until a patch is released.
2. Short-term: Implement a Web Application Firewall (WAF) rule to block requests to unknown AJAX actions.
3. Long-term: Monitor the plugin’s update channel and apply patches as soon as they become available.
4. Alternative: Replace the plugin with a similar, actively maintained alternative that has proper authorization checks.

Valters IT
Securing Digital Frontiers