CVE-2025-22698

Executive Summary

CVE-2025-22697 is a Missing Authorization vulnerability (CWE-862) in the Accessibility Suite WordPress plugin developed by Ability, Inc. This flaw allows an unauthenticated attacker to exploit incorrectly configured access control security levels, potentially leading to unauthorized data access, modification, or privilege escalation. The vulnerability affects all versions up to and including 4.18. As of this report, no official patch has been released, and the vendor's patch status remains unknown.

The vulnerability is classified as a WordPress ecosystem issue, specifically within the plugin's permission handling. It does not involve Apache or Nginx misconfigurations. The CVSS v3.1 base score is 6.3 (Medium), with a low EPSS probability (0.0%), indicating low active exploitation in the wild. However, the lack of a patch makes it a significant risk for sites running the affected plugin.

Supply Chain & Package Security

This vulnerability is specific to the WordPress plugin ecosystem. The plugin is distributed via the official WordPress plugin repository and third-party marketplaces. Since no patch is available, site administrators must consider removing or disabling the plugin until a fix is released. The absence of a patch also means that supply chain integrity is compromised, as users cannot update to a secure version.

CVSS Breakdown & Threat Level

• CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
• Base Score: 6.3 (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 data exposure.
• Integrity Impact: Low (I:L) – Limited data modification.
• Availability Impact: Low (A:L) – Limited service disruption.

Threat Level: Medium. The vulnerability is easy to exploit but has limited impact. However, the lack of a patch elevates the risk for affected sites.

Deep Dive & Mechanics

The vulnerability resides in the Accessibility Suite plugin's authorization checks. The plugin fails to properly validate user permissions when processing certain AJAX requests or REST API endpoints. Specifically, it does not enforce capability checks (e.g., manage_options or edit_posts) before executing sensitive actions.

Root Cause: The plugin uses wp_ajax_nopriv_* hooks without verifying user roles, allowing unauthenticated users to trigger privileged functions. This is a classic case of Missing Authorization (CWE-862).

Attack Vector: An attacker can send crafted HTTP requests to the vulnerable endpoints, bypassing access controls. For example, a request to /wp-admin/admin-ajax.php?action=accessibility_suite_update_settings with arbitrary parameters could modify plugin settings without authentication.

Impact: Successful exploitation could allow an attacker to:

• Modify accessibility settings (e.g., font size, contrast).
• Inject malicious JavaScript into the plugin's output (stored XSS).
• Escalate privileges if the plugin interacts with user roles.
• Exfiltrate sensitive data stored by the plugin.

Vulnerable vs. Patched Code

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

// Vulnerable: No capability check
add_action('wp_ajax_nopriv_accessibility_suite_update', 'handle_update');
function handle_update() {
    // Process request without checking user permissions
    update_option('accessibility_suite_settings', $_POST['settings']);
}

A patched version would include a capability check:

// Patched: Capability check added
add_action('wp_ajax_accessibility_suite_update', 'handle_update');
function handle_update() {
    if (!current_user_can('manage_options')) {
        wp_die('Unauthorized');
    }
    update_option('accessibility_suite_settings', $_POST['settings']);
}

The key difference is the removal of the nopriv_ prefix (which allows unauthenticated access) and the addition of current_user_can().

Exploitation & Lab Setup

Red Team (Exploitation)

Prerequisites:

• Target WordPress site with Accessibility Suite <= 4.18 installed.
• Network access to the site.

Exploitation Steps:

1. Identify Vulnerable Endpoint: Use a tool like Burp Suite or curl to probe for AJAX actions. Common actions include accessibility_suite_update_settings, accessibility_suite_save_config, etc.

2. Craft Exploit Request: Send a POST request to the vulnerable endpoint without authentication.

curl -X POST http://target.com/wp-admin/admin-ajax.php \
  -d "action=accessibility_suite_update_settings&setting=font_size&value=large"

3. Verify Exploitation: Check if the setting was changed by visiting the site's frontend.

Advanced Exploitation: If the plugin stores user data, an attacker could modify user roles or inject malicious scripts.

Blue Team (Detection & Defense)

Detection:

• Monitor for unusual AJAX requests to admin-ajax.php with nopriv_ actions.
• Look for requests from unauthenticated users to plugin-specific endpoints.
• Check for sudden changes in plugin settings without corresponding admin activity.

Defense:

• Disable or remove the plugin immediately.
• Implement a Web Application Firewall (WAF) rule to block requests to known vulnerable endpoints.
• Use a security plugin like Wordfence to monitor for unauthorized AJAX calls.

Lab Setup:

• Install WordPress with the vulnerable plugin in a sandbox environment.
• Use a tool like curl or Postman to send test requests.
• Monitor logs with tail -f /var/log/apache2/access.log.

Indicators of Compromise (IOCs)

• Network IOCs:
  • POST requests to /wp-admin/admin-ajax.php with action=accessibility_suite_* parameters from unauthenticated IPs.
  • Unusual User-Agent strings in requests targeting the plugin.
• File IOCs:
  • Modified plugin files in /wp-content/plugins/accessibility-suite/.
  • Unexpected entries in wp_options table with accessibility_suite_ prefix.
• Log IOCs:
  • Repeated 200 responses to admin-ajax.php without prior authentication.
  • PHP error logs showing "Undefined index" or "Unauthorized" messages.

Detection Engineering

YARA Rule

rule Detect_Accessibility_Suite_Exploit {
    meta:
        description = "Detects exploitation attempts against CVE-2025-22697"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-22697"
    strings:
        $ajax_action = "accessibility_suite_" nocase
        $nopriv = "wp_ajax_nopriv_" nocase
        $post_param = "action=" nocase
    condition:
        all of them
}

Sigma Rule

title: CVE-2025-22697 - Accessibility Suite Missing Authorization
id: 8a9b7c6d-5e4f-3a2b-1c0d-9e8f7a6b5c4d
status: experimental
description: Detects unauthenticated AJAX requests to Accessibility Suite plugin
author: Valters IT
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-method: 'POST'
        cs-uri-query|contains: 'admin-ajax.php'
        cs-uri-query|contains: 'action=accessibility_suite_'
    condition: selection
falsepositives:
    - Legitimate admin actions (rare)
level: high

Suricata Rule

alert http any any -> $HOME_NET any (
    msg:"CVE-2025-22697 - Accessibility Suite Missing Authorization Exploit";
    flow:to_server,established;
    content:"POST"; http_method;
    content:"admin-ajax.php"; http_uri;
    content:"action=accessibility_suite_"; http_client_body;
    classtype:attempted-admin;
    sid:1000001;
    rev:1;
)

Remediation & Mitigation

Immediate Actions:

1. Disable the plugin – Deactivate and delete the Accessibility Suite plugin from all WordPress installations.
2. Apply virtual patching – Use a WAF to block requests containing accessibility_suite_ in the action parameter.
3. Audit user roles – Review and revoke any unauthorized privilege changes.

Long-term Fix:

• Monitor the vendor's website for a patched version (>= 4.19).
• If no patch is released, consider migrating to an alternative accessibility plugin.
• Implement a plugin update policy to ensure timely patching.

Workaround:

• Add the following code to the theme's functions.php to block unauthenticated access:

add_action('init', function() {
    if (defined('DOING_AJAX') && DOING_AJAX) {
        if (strpos($_REQUEST['action'], 'accessibility_suite_') === 0 && !is_user_logged_in()) {
            wp_die('Unauthorized');
        }
    }
});

Valters IT
Securing Digital Frontiers