CVE-2026-25312: EventPrime Auth Bypass Vulnerability

CVE-2026-25312 Overview

CVE-2026-25312 is a Missing Authorization vulnerability affecting the EventPrime WordPress plugin, a popular event calendar management solution. This vulnerability allows attackers to exploit incorrectly configured access control security levels, enabling unauthorized actions that bypass payment requirements. The flaw exists in versions through 4.2.8.3 and can be exploited remotely without authentication.

Critical Impact

Attackers can bypass payment mechanisms in the EventPrime plugin, potentially allowing unauthorized access to paid events and causing financial losses for event organizers.

Affected Products

• EventPrime WordPress Plugin versions through 4.2.8.3

Discovery Timeline

• 2026-03-19 - CVE CVE-2026-25312 published to NVD
• 2026-03-19 - Last updated in NVD database

Technical Details for CVE-2026-25312

Vulnerability Analysis

This Missing Authorization vulnerability (CWE-862) in EventPrime stems from inadequate access control enforcement in the plugin's payment processing workflow. The vulnerability allows unauthenticated users to bypass authorization checks that should protect paid event registrations and ticket purchases.

The flaw enables attackers to manipulate requests to the plugin's API endpoints, circumventing the payment verification process entirely. This type of vulnerability is particularly damaging in e-commerce contexts where financial transactions are involved, as it undermines the core business logic of the application.

Root Cause

The root cause is improper implementation of authorization checks in the EventPrime plugin's payment processing functionality. The plugin fails to adequately verify that users have completed required payment steps before granting access to paid event features. This represents a classic broken access control scenario where the application assumes trust based on user-supplied data rather than server-side verification of payment status.

Attack Vector

The attack vector is network-based and requires no prior authentication or user interaction. An attacker can craft malicious HTTP requests directly to vulnerable endpoints in the EventPrime plugin. By manipulating request parameters or bypassing client-side validation, the attacker can register for paid events or obtain tickets without completing the payment process.

The vulnerability is exploitable by sending specially crafted requests to the plugin's registration or booking endpoints, effectively skipping the payment verification step. For detailed technical information about exploitation mechanics, refer to the Patchstack Vulnerability Advisory.

Detection Methods for CVE-2026-25312

Indicators of Compromise

• Unusual event registrations appearing without corresponding payment records in the database
• Multiple successful event bookings from the same IP address or user within a short timeframe
• Event attendance records that do not match payment gateway transaction logs
• Web server logs showing direct API requests to EventPrime endpoints bypassing the standard checkout flow

Detection Strategies

• Monitor WordPress database for event registrations that lack associated payment transaction IDs
• Implement logging on EventPrime API endpoints to track registration attempts and correlate with payment confirmations
• Review web access logs for suspicious patterns of requests to /wp-json/eventprime/ or plugin-specific AJAX handlers
• Deploy Web Application Firewall (WAF) rules to detect and alert on anomalous request patterns to event registration endpoints

Monitoring Recommendations

• Enable detailed logging for all EventPrime plugin activities, particularly registration and payment workflows
• Configure alerts for event registrations that bypass the standard payment workflow
• Regularly audit event attendance lists against payment records to identify discrepancies
• Monitor for unusual spikes in free registrations or registrations with abnormal payment statuses

How to Mitigate CVE-2026-25312

Immediate Actions Required

• Update the EventPrime WordPress plugin to the latest patched version immediately
• Audit existing event registrations and bookings for signs of unauthorized access or payment bypass
• Temporarily disable paid event registration functionality if an update cannot be applied immediately
• Review and reconcile all recent event registrations against payment gateway records

Patch Information

The vulnerability affects EventPrime versions through 4.2.8.3. Website administrators should update to a version newer than 4.2.8.3 that contains the security fix. Check the Patchstack Vulnerability Advisory for the latest patch information and remediation guidance.

Workarounds

• Implement server-side payment verification using your payment gateway's webhook or API to confirm transaction completion before finalizing registrations
• Add custom authorization checks in your WordPress theme's functions.php to validate payment status before allowing event access
• Use a security plugin to restrict access to EventPrime API endpoints from untrusted sources
• Consider temporarily switching to manual event registration approval while awaiting the patch

# WordPress plugin update via WP-CLI
wp plugin update eventprime-event-calendar-management --version=latest

# Verify current installed version
wp plugin get eventprime-event-calendar-management --field=version

# If update unavailable, temporarily deactivate the plugin
wp plugin deactivate eventprime-event-calendar-management