CVE-2025-39482: Imithemes Eventer Auth Bypass Vulnerability

CVE-2025-39482 Overview

CVE-2025-39482 is a missing authorization vulnerability in the imithemes Eventer plugin for WordPress, a commercial event booking manager. The flaw stems from incorrectly configured access control security levels, allowing authenticated users with low privileges to perform actions reserved for higher-privileged roles. The issue affects all Eventer versions up to and including 3.11.4. The vulnerability is classified under CWE-862: Missing Authorization and carries a network attack vector requiring only low privileges.

Critical Impact
An authenticated attacker with minimal privileges can exploit broken access control in Eventer to compromise confidentiality, integrity, and availability of WordPress sites running the plugin.

Affected Products

imithemes Eventer WordPress plugin versions through 3.11.4
WordPress sites with Eventer Event Booking Manager installed
All site configurations exposing authenticated low-privilege user roles (subscriber and above)

Discovery Timeline

2025-05-16 - CVE-2025-39482 published to the National Vulnerability Database
2026-04-23 - Last updated in NVD database

Technical Details for CVE-2025-39482

Vulnerability Analysis

The Eventer plugin exposes plugin actions and AJAX endpoints without verifying that the calling user holds the required WordPress capability. Authenticated users with low privileges, such as subscribers, can invoke functions intended for administrators or event managers. The result is broken access control that compromises booking data, event configuration, and plugin state. Because Eventer manages paid event registrations, exploitation can affect financial transactions, customer records, and front-end content displayed across the WordPress site. The vulnerability is exploitable remotely over the network with low attack complexity and requires no user interaction.

Root Cause

The root cause is the absence of authorization checks within plugin handlers. WordPress provides current_user_can() and nonce verification primitives, but the affected Eventer endpoints either omit capability checks entirely or apply them to the wrong action. This pattern, classified as [CWE-862], allows any logged-in account to reach privileged code paths through normal HTTP requests to admin-ajax.php or plugin-registered endpoints.

Attack Vector

An attacker first obtains a low-privileged WordPress account, either by registering on a site that permits open registration or by compromising existing subscriber credentials. The attacker then issues authenticated HTTP POST requests to the vulnerable Eventer AJAX actions. Because the plugin trusts the session without confirming role or capability, the requests execute with the effective authority of an administrator within the plugin's scope. The attacker can modify event records, alter booking data, exfiltrate registration details, or change plugin settings.

No verified exploit code is publicly available. See the Patchstack WordPress Plugin Advisory for vendor-coordinated technical details.

Detection Methods for CVE-2025-39482

Indicators of Compromise

Unexpected POST requests to wp-admin/admin-ajax.php containing Eventer-specific action parameters from subscriber-level accounts
Unauthorized modifications to event posts, booking records, or plugin options in the WordPress database
New or altered event entries created outside normal administrator workflows
Spikes in authenticated requests from low-reputation IP addresses targeting Eventer endpoints

Detection Strategies

Audit WordPress access logs for admin-ajax.php requests where the authenticated user role does not match the privilege level expected by the invoked Eventer action
Compare current versions of Eventer event and booking database tables against known-good baselines to identify unauthorized changes
Deploy a web application firewall ruleset that flags subscriber-role requests targeting plugin administrative endpoints

Monitoring Recommendations

Enable WordPress audit logging plugins to record capability checks, option changes, and post modifications attributed to Eventer
Monitor user registration trends to identify automated creation of subscriber accounts preceding plugin exploitation
Alert on Eventer plugin option changes, especially modifications to payment, pricing, or notification settings

How to Mitigate CVE-2025-39482

Immediate Actions Required

Update the Eventer plugin to a version newer than 3.11.4 as soon as the vendor patch is available through the WordPress plugin repository
Disable open user registration on sites running vulnerable Eventer versions until patching is complete
Audit existing subscriber and customer accounts and reset passwords for any accounts showing suspicious activity
Review event and booking records for unauthorized modifications and restore from backup if tampering is identified

Patch Information

The vendor has addressed the broken access control issue in releases following Eventer 3.11.4. Site administrators should consult the Patchstack WordPress Plugin Advisory for the fixed version and apply the update through the WordPress administrator dashboard or via WP-CLI.

Workarounds

Deactivate the Eventer plugin until a patched version is installed if event booking functionality is non-critical
Restrict access to wp-admin/admin-ajax.php from unauthenticated and low-privileged users using web application firewall rules
Apply virtual patching at the WAF layer to block requests to known-vulnerable Eventer AJAX actions originating from non-administrator sessions
Remove the subscriber role's ability to access plugin endpoints by enforcing capability checks through a security plugin

bash

# Update Eventer plugin via WP-CLI once the patched release is available
wp plugin update eventer --version=<patched-version>

# Verify installed version
wp plugin get eventer --field=version

# Temporarily deactivate the plugin if patching is delayed
wp plugin deactivate eventer