CVE-2025-66148

Executive Summary

CVE-2025-66148 is a Missing Authorization vulnerability in the Conformer for Elementor WordPress plugin by Merkulove. This flaw allows an authenticated attacker with low privileges (e.g., subscriber) to exploit incorrectly configured access control security levels, potentially leading to unauthorized data modification or disclosure. The vulnerability affects all versions up to and including 1.0.7. As of this report, no official patch has been released, and no public proof-of-concept (PoC) or exploit code is available. The EPSS score is 0.0%, indicating low exploitation activity in the wild, but the risk remains due to the widespread use of Elementor and its ecosystem.

Supply Chain & Package Security

This vulnerability resides in a WordPress plugin, which is part of the broader WordPress ecosystem. WordPress plugins are often distributed via the official WordPress Plugin Directory or third-party marketplaces. Users should verify the integrity of the plugin files by checking checksums or using a plugin integrity checker. Since no patch is available, users must consider removing or disabling the plugin until a fix is released.

CVSS Breakdown & Threat Level

• CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
• Base Score: 5.4 (Medium)
• Attack Vector: Network
• Attack Complexity: Low
• Privileges Required: Low
• User Interaction: None
• Scope: Unchanged
• Confidentiality Impact: Low
• Integrity Impact: Low
• Availability Impact: None

Threat Level: Medium. The vulnerability requires authentication but can be exploited by low-privileged users. The impact is limited to low confidentiality and integrity loss, but combined with other vulnerabilities, it could be chained for more severe attacks.

Deep Dive & Mechanics

The vulnerability stems from missing authorization checks in the conformer-elementor plugin. The plugin likely exposes AJAX actions or REST API endpoints that perform sensitive operations (e.g., saving settings, modifying content) without verifying that the current user has the required capabilities (e.g., manage_options or edit_posts). An attacker with a subscriber or contributor account can send crafted requests to these endpoints, bypassing access controls.

Root Cause: The plugin fails to call current_user_can() or similar WordPress capability checks before executing privileged actions. This is a classic case of CWE-862 (Missing Authorization).

Attack Vector:

1. Attacker authenticates as a low-privileged user (e.g., subscriber).
2. Attacker identifies vulnerable AJAX actions or REST routes (e.g., wp_ajax_conformer_save_settings).
3. Attacker sends a crafted POST request with malicious parameters.
4. The plugin processes the request without checking capabilities, leading to unauthorized changes.

Vulnerable vs. Patched Code

Since no patch is available, we can only infer the vulnerable code pattern. A typical vulnerable snippet might look like:

// Vulnerable code (conformer-elementor/includes/class-ajax.php)
add_action('wp_ajax_conformer_save_settings', 'conformer_save_settings');
function conformer_save_settings() {
    // Missing capability check
    update_option('conformer_settings', $_POST['settings']);
    wp_send_json_success();
}

A patched version would include a capability check:

// Patched code
add_action('wp_ajax_conformer_save_settings', 'conformer_save_settings');
function conformer_save_settings() {
    if (!current_user_can('manage_options')) {
        wp_die('Unauthorized', 403);
    }
    update_option('conformer_settings', $_POST['settings']);
    wp_send_json_success();
}

Exploitation & Lab Setup

Red Team (Exploitation)

Prerequisites:

• WordPress installation with Conformer for Elementor <= 1.0.7
• Low-privileged user account (e.g., subscriber)

Exploitation Steps:

1. Log in as a subscriber.
2. Identify the vulnerable AJAX action (e.g., conformer_save_settings).
3. Craft a POST request using a tool like curl or Burp Suite:

curl -X POST http://target.com/wp-admin/admin-ajax.php \
  -H "Cookie: wordpress_logged_in_xxx=..." \
  -d "action=conformer_save_settings&settings[some_option]=malicious_value"

4. Verify the unauthorized change (e.g., check the wp_options table).

Note: No public exploit code is available, so this is a theoretical approach.

Blue Team (Detection & Hardening)

Detection:

• Monitor AJAX requests to admin-ajax.php with suspicious action parameters.
• Look for requests from low-privileged users to actions that should require higher privileges.
• Use the Sigma rule below to detect exploitation attempts.

Hardening:

• Disable the plugin until a patch is released.
• Implement a Web Application Firewall (WAF) rule to block requests to known vulnerable actions.
• Restrict user roles and capabilities using a plugin like "User Role Editor".

Indicators of Compromise (IOCs)

• File Paths:
  • /wp-content/plugins/conformer-elementor/
  • /wp-content/plugins/conformer-elementor/includes/class-ajax.php
• Log Entries:
  • Repeated admin-ajax.php requests with action=conformer_* from low-privileged users.
• Database Changes:
  • Unexpected modifications to wp_options table entries prefixed with conformer_.
• Network Indicators:
  • POST requests to /wp-admin/admin-ajax.php with body containing action=conformer_.

Detection Engineering

YARA Rule

rule CVE_2025_66148_Conformer_Elementor {
    meta:
        description = "Detects vulnerable Conformer for Elementor plugin files"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-66148"
    strings:
        $vuln_func = "add_action('wp_ajax_conformer_" ascii wide nocase
        $missing_check = "current_user_can" ascii wide nocase
    condition:
        $vuln_func and not $missing_check
}

Sigma Rule

title: CVE-2025-66148 - Missing Authorization in Conformer for Elementor
id: 8a4b3c2d-1e5f-4a7b-9c8d-0e1f2a3b4c5d
status: experimental
description: Detects exploitation attempts of missing authorization in Conformer for Elementor plugin
author: Valters IT
date: 2025-04-10
references:
    - https://nvd.nist.gov/vuln/detail/CVE-2025-66148
logsource:
    category: webserver
    product: apache
    service: access_combined
detection:
    selection:
        cs-method: 'POST'
        cs-uri-query|contains: 'admin-ajax.php'
        cs-uri-query|contains: 'action=conformer_'
        sc-status: 200
    condition: selection
falsepositives:
    - Legitimate admin actions (rare)
level: medium

Suricata Rule

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"CVE-2025-66148 - Conformer for Elementor Missing Authorization Exploit";
    flow:to_server,established;
    content:"POST"; http_method;
    content:"admin-ajax.php"; http_uri;
    content:"action=conformer_"; http_client_body;
    classtype:attempted-admin;
    sid:10000001;
    rev:1;
    reference:cve,2025-66148;
)

Remediation & Mitigation

Immediate Actions:

1. Disable the plugin until a patch is released.
2. Review user roles and remove any unnecessary low-privileged accounts.
3. Monitor logs for suspicious AJAX requests.

Long-term Fix:

• The vendor (Merkulove) must release a patched version that adds proper capability checks (e.g., current_user_can('manage_options')) to all AJAX handlers.
• Users should update to the latest version once available.

Workaround:

• Implement a custom plugin or mu-plugin that hooks into the vulnerable actions and adds capability checks:

add_action('wp_ajax_conformer_save_settings', function() {
    if (!current_user_can('manage_options')) {
        wp_die('Unauthorized', 403);
    }
}, 1);

Valters IT
Securing Digital Frontiers