CVE-2025-13312: WordPress CRM Auth Bypass Vulnerability

CVE-2025-13312 Overview

CVE-2025-13312 affects the CRM Memberships plugin for WordPress through version 2.5. The plugin exposes the ntzcrm_add_new_tag function without a capability check, allowing unauthenticated attackers to create arbitrary membership tags. Attackers can also modify CRM configuration that should remain restricted to administrators. The vulnerability maps to CWE-862: Missing Authorization and is exploitable over the network without user interaction. Wordfence published the initial vulnerability report and referenced the affected code in the plugin's public repository.

Critical Impact
Unauthenticated network attackers can create arbitrary membership tags and alter CRM configuration on any WordPress site running CRM Memberships 2.5 or earlier.

Affected Products

WordPress CRM Memberships plugin, all versions up to and including 2.5
WordPress sites with CRM Memberships installed and activated
Administrator-scoped CRM configuration exposed by the ntzcrm_add_new_tag endpoint

Discovery Timeline

2025-12-05 - CVE-2025-13312 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-13312

Vulnerability Analysis

The CRM Memberships plugin registers an AJAX endpoint that maps to the ntzcrm_add_new_tag function. The handler creates a new membership tag and updates CRM configuration entries associated with tagging. The function omits both a current_user_can() capability check and a nonce verification tied to an authenticated context. Because WordPress routes wp_ajax_nopriv_* handlers to unauthenticated users, requests arriving without a valid session still reach the vulnerable code path.

Successful exploitation results in integrity impact only. Attackers cannot read protected data or halt site availability directly through this flaw. However, arbitrary tag creation can pollute CRM records, bypass administrator workflows, and stage follow-on attacks against membership logic that trusts tag values. The Wordfence advisory documents the endpoint registration at line 14 and the handler implementation at line 828 of class-ntzcrm-api.php.

Root Cause

The root cause is a missing authorization check in ntzcrm_add_new_tag. The function performs privileged state changes without validating the caller's role or capabilities, violating the principle that administrative operations require authenticated administrator context.

Attack Vector

Exploitation requires only a crafted HTTP POST request to the plugin's AJAX endpoint with the action parameter set to ntzcrm_add_new_tag and attacker-supplied tag data. No credentials, tokens, or user interaction are required. The vulnerability manifests in the plugin's API class. See the Wordfence Vulnerability Report and the affected code at class-ntzcrm-api.php line 828 for technical details.

Detection Methods for CVE-2025-13312

Indicators of Compromise

Unexpected new entries in the CRM Memberships tag taxonomy or associated database tables that no administrator created
HTTP POST requests to /wp-admin/admin-ajax.php containing action=ntzcrm_add_new_tag from unauthenticated sessions
Changes to CRM configuration options with no corresponding administrator login in the audit trail

Detection Strategies

Enable WordPress access logging and search web server logs for admin-ajax.php requests carrying the ntzcrm_add_new_tag action parameter without an authenticated wordpress_logged_in_* cookie
Compare snapshots of the CRM Memberships tag table against a known-good baseline to identify unauthorized additions
Alert on HTTP 200 responses to admin-ajax.php where the source IP has no prior authenticated activity

Monitoring Recommendations

Forward WordPress and web server logs to a centralized log platform and build queries for the ntzcrm_add_new_tag action string
Monitor plugin file integrity for includes/class/class-ntzcrm-api.php to detect tampering or downgrade attempts
Track outbound requests from the WordPress host that follow tag-creation events to identify chained abuse

How to Mitigate CVE-2025-13312

Immediate Actions Required

Update the CRM Memberships plugin to a version later than 2.5 as soon as the vendor publishes a fixed release
If no patched version is available, deactivate and remove the CRM Memberships plugin until a fix ships
Audit the CRM Memberships tag list and configuration for unauthorized entries and remove any that cannot be attributed to a legitimate administrator

Patch Information

No fixed version is identified in the referenced advisories at the time of publication. Consult the Wordfence Vulnerability Report and the WordPress plugin repository for updates. Verify plugin version 2.5 or earlier is not present after applying any fix.

Workarounds

Block unauthenticated POST requests to admin-ajax.php with action=ntzcrm_add_new_tag at a web application firewall or reverse proxy
Restrict access to /wp-admin/admin-ajax.php to authenticated sessions where the plugin's public AJAX surface is not required
Remove or rename the class-ntzcrm-api.php file if the plugin's functionality is not in active use, pending a vendor patch

bash

# Example nginx rule blocking the vulnerable action for unauthenticated clients
location = /wp-admin/admin-ajax.php {
    if ($request_method = POST) {
        if ($args ~* "action=ntzcrm_add_new_tag") {
            return 403;
        }
        if ($http_cookie !~* "wordpress_logged_in_") {
            set $block_ajax "1$block_ajax";
        }
    }
    if ($block_ajax = "11") {
        return 403;
    }
}