CVE-2026-65567: Event Tickets Auth Bypass Vulnerability

CVE-2026-65567 Overview

CVE-2026-65567 is an unauthenticated broken access control vulnerability affecting the Event Tickets WordPress plugin in versions up to and including 5.29.0.1. The flaw stems from missing authorization checks [CWE-862], allowing remote attackers to interact with restricted plugin functionality without credentials. The issue is exploitable over the network with low attack complexity and requires no user interaction. Successful exploitation can lead to limited integrity impact on affected WordPress installations. The vulnerability was published to the National Vulnerability Database (NVD) on 2026-07-27.

Critical Impact
Unauthenticated attackers can reach protected Event Tickets plugin functionality due to missing authorization, resulting in limited integrity impact across affected WordPress sites.

Affected Products

Event Tickets WordPress plugin versions <= 5.29.0.1
WordPress sites running the vulnerable plugin release
Deployments exposing the plugin endpoints to the public internet

Discovery Timeline

2026-07-27 - CVE CVE-2026-65567 published to NVD
2026-07-27 - Last updated in NVD database

Technical Details for CVE-2026-65567

Vulnerability Analysis

The Event Tickets plugin exposes functionality that fails to enforce authorization checks before executing sensitive operations. Under CWE-862 (Missing Authorization), the affected code paths do not verify whether the requesting user holds the capability required to perform the action. As a result, an unauthenticated remote actor can invoke the affected endpoints directly. The vendor advisory published by Patchstack classifies the issue as broken access control impacting all versions through 5.29.0.1.

Root Cause

The root cause is the absence of capability or nonce validation in one or more request handlers within the Event Tickets plugin. WordPress plugins are expected to call current_user_can() or equivalent checks prior to state-changing operations. When these checks are missing, requests bypass the intended access model. The available advisory describes the defect as broken access control, consistent with a missing authorization primitive rather than a logic flaw in an existing check.

Attack Vector

Exploitation requires only network access to the target WordPress site. An attacker sends a crafted HTTP request to the vulnerable plugin endpoint without supplying authentication tokens or a valid session. The request reaches the handler, which processes it as if the caller were authorized. No social engineering or user interaction is needed. The impact profile from the CVSS vector limits successful attacks to integrity effects, meaning the attacker can modify or influence plugin-managed data but cannot directly read confidential records or take the site offline.

For technical specifics on the affected code paths, consult the Patchstack WordPress Vulnerability Advisory.

Detection Methods for CVE-2026-65567

Indicators of Compromise

Unexpected modifications to Event Tickets records, ticket configurations, or associated post metadata without a corresponding administrator session.
HTTP requests to Event Tickets plugin endpoints originating from anonymous clients that produce 200 responses for state-changing operations.
Anomalous entries in WordPress audit logs referencing plugin actions performed by unauthenticated or guest users.

Detection Strategies

Inspect web server access logs for POST or GET requests targeting Event Tickets plugin routes without an authenticated session cookie.
Correlate database writes to Event Tickets tables against WordPress user session activity to surface unauthorized changes.
Deploy WordPress security plugins or a Web Application Firewall (WAF) rule that flags access to plugin endpoints requiring privileged capabilities.

Monitoring Recommendations

Enable verbose logging on the WordPress site and forward logs to a centralized SIEM for correlation.
Monitor the installed version of the Event Tickets plugin across the estate and alert when hosts run <= 5.29.0.1.
Track outbound requests from the site that could indicate follow-on abuse after unauthorized plugin interaction.

How to Mitigate CVE-2026-65567

Immediate Actions Required

Update the Event Tickets plugin to a version newer than 5.29.0.1 as soon as the vendor-supplied fix is available.
Audit Event Tickets records for unauthorized modifications introduced prior to patching.
Restrict administrative and plugin endpoints at the WAF or reverse proxy to trusted IP ranges where feasible.

Patch Information

Refer to the Patchstack WordPress Vulnerability Advisory for the fixed version reference and remediation guidance. Apply the upgrade through the WordPress plugin management interface or via WP-CLI, then verify the installed version.

Workarounds

Temporarily disable the Event Tickets plugin if patching cannot be performed immediately.
Apply WAF rules that block anonymous requests to the affected plugin endpoints until the update is deployed.
Enforce authentication in front of the WordPress admin surface using HTTP basic auth or an identity-aware proxy.

bash

# Verify and update the Event Tickets plugin using WP-CLI
wp plugin get event-tickets --field=version
wp plugin update event-tickets
wp plugin get event-tickets --field=version