CVE-2025-58672

Executive Summary

CVE-2025-58672 is a Missing Authorization vulnerability in the weDevs WP User Frontend WordPress plugin, affecting versions up to and including 4.1.12. This flaw allows an unauthenticated attacker to exploit incorrectly configured access control security levels, potentially leading to unauthorized data access or modification. The vulnerability resides in the WordPress ecosystem, specifically within the plugin's handling of user permissions for frontend submissions and profile management. With a CVSS score of 5.4 (Medium), the risk is elevated due to the lack of required privileges and the potential for exploitation over the network. No public proof-of-concept (PoC) or patch is currently available, making proactive detection and mitigation critical.

Supply Chain & Package Security

This vulnerability affects a WordPress plugin distributed via the official WordPress plugin repository and third-party marketplaces. Organizations using WP User Frontend should verify the integrity of their plugin files and monitor for any unauthorized modifications. Since no patch is available, 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:N/UI:N/S:U/C:L/I:L/A:N
• Base Score: 5.4 (Medium)
• Attack Vector: Network (AV:N) – Exploitable remotely.
• Attack Complexity: Low (AC:L) – No special conditions required.
• Privileges Required: None (PR:N) – No authentication needed.
• User Interaction: None (UI:N) – No user action required.
• Scope: Unchanged (S:U) – Impact confined to the vulnerable component.
• Confidentiality Impact: Low (C:L) – Limited unauthorized data access.
• Integrity Impact: Low (I:L) – Limited unauthorized data modification.
• Availability Impact: None (A:N) – No denial of service.

Threat Level: Medium. The low EPSS score (0.0%) suggests limited active exploitation, but the lack of a patch and the plugin's widespread use in WordPress environments elevate the risk.

Deep Dive & Mechanics

The vulnerability stems from Missing Authorization (CWE-862) in the WP User Frontend plugin. The plugin provides frontend forms for user registration, login, profile editing, and content submission. The flaw occurs when the plugin fails to properly verify user capabilities before executing sensitive actions, such as modifying user profiles or accessing private data.

Root Cause: The plugin's access control checks are either absent or incorrectly configured, allowing unauthenticated users to bypass authorization. For example, an AJAX handler or REST endpoint may not validate the current user's role or capabilities before processing requests.

Attack Vector: An attacker can send crafted HTTP requests to the WordPress site, targeting vulnerable endpoints without authentication. This could lead to:

• Unauthorized viewing or editing of other users' profiles.
• Modification of frontend post submissions.
• Potential privilege escalation if combined with other flaws.

Impact: While the CVSS score indicates low confidentiality and integrity impact, the actual risk depends on the site's configuration. In multi-user environments, this could lead to data leaks or content manipulation.

Vulnerable vs. Patched Code

Since no patch is available, a comparison cannot be provided. However, based on the vulnerability type, the fix would involve adding proper capability checks (e.g., current_user_can()) to all sensitive functions and AJAX handlers.

Example of vulnerable code pattern (hypothetical):

add_action('wp_ajax_nopriv_update_profile', 'handle_profile_update');
function handle_profile_update() {
    // Missing capability check
    $user_id = $_POST['user_id'];
    update_user_meta($user_id, 'description', $_POST['description']);
}

Patched code pattern:

add_action('wp_ajax_nopriv_update_profile', 'handle_profile_update');
function handle_profile_update() {
    if (!current_user_can('edit_user', $_POST['user_id'])) {
        wp_die('Unauthorized');
    }
    $user_id = $_POST['user_id'];
    update_user_meta($user_id, 'description', $_POST['description']);
}

Exploitation & Lab Setup

Red Team (Offensive)

Lab Setup:

1. Install WordPress with WP User Frontend plugin version 4.1.12.
2. Create a test user with subscriber role.
3. Identify vulnerable endpoints using plugin source code review or fuzzing.

Exploitation Steps:

1. Enumerate AJAX actions registered by the plugin (e.g., wpuf_update_profile, wpuf_submit_post).
2. Send a crafted POST request without authentication:

   curl -X POST http://target.com/wp-admin/admin-ajax.php \
     -d 'action=wpuf_update_profile&user_id=2&description=Hacked'
   

3. Verify unauthorized modification of user profile.

Note: No public exploit code is available; this is a hypothetical demonstration.

Blue Team (Defensive)

Detection:

• Monitor for unusual AJAX requests to admin-ajax.php with wpuf_* actions from unauthenticated users.
• Log all failed authorization attempts in WordPress.

Mitigation:

• Disable the plugin until a patch is released.
• Implement a Web Application Firewall (WAF) rule to block unauthenticated requests to plugin-specific endpoints.
• Use WordPress security plugins to enforce capability checks.

Indicators of Compromise (IOCs)

• Network: HTTP POST requests to /wp-admin/admin-ajax.php with parameters containing action=wpuf_* and no authentication cookies.
• Logs: WordPress debug logs showing wp_die calls for unauthorized access attempts.
• File: Modified user meta entries in the database (e.g., wp_usermeta table) without corresponding user actions.
• Behavior: Unauthorized changes to user profiles or frontend posts.

Detection Engineering

YARA Rule

rule CVE_2025_58672_WP_User_Frontend {
    meta:
        description = "Detects exploitation attempts for CVE-2025-58672 in WP User Frontend"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "https://nvd.nist.gov/vuln/detail/CVE-2025-58672"
    strings:
        $ajax_action = "wpuf_" ascii wide nocase
        $admin_ajax = "admin-ajax.php" ascii wide nocase
    condition:
        $ajax_action and $admin_ajax
}

Sigma Rule

title: CVE-2025-58672 WP User Frontend Missing Authorization
id: 8a4b3c2d-1e5f-4a7b-9c8d-0e1f2a3b4c5d
status: experimental
description: Detects unauthenticated AJAX requests targeting WP User Frontend plugin
author: Valters IT
date: 2025-04-10
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-method: 'POST'
        c-uri|contains: '/wp-admin/admin-ajax.php'
        cs-uri-query|contains: 'action=wpuf_'
        sc-status: 200
    condition: selection
falsepositives:
    - Legitimate plugin functionality (requires authentication)
level: medium

Suricata Rule

alert http any any -> any any (msg:"CVE-2025-58672 WP User Frontend Missing Authorization Attempt"; flow:to_server; content:"POST"; http_method; content:"/wp-admin/admin-ajax.php"; http_uri; content:"action=wpuf_"; http_client_body; classtype:attempted-recon; sid:1000001; rev:1;)

Remediation & Mitigation

1. Immediate Action: Disable or remove the WP User Frontend plugin until a patched version is released.
2. Workaround: Implement a WAF rule to block unauthenticated requests to admin-ajax.php with wpuf_* actions.
3. Monitoring: Enable detailed logging for AJAX requests and monitor for suspicious patterns.
4. Patch: Apply the official patch from weDevs when available. Check the WordPress plugin repository for updates.
5. Long-term: Conduct a security audit of all WordPress plugins to identify similar authorization flaws.

Valters IT
DevSecOps & Cyber Threat Intelligence
Report generated for CVE-2025-58672