CVE-2026-105891 in Event Tickets Plugin
Summary
by MITRE • 10/08/2026
Missing Authorization vulnerability in Liquid Web / StellarWP Event Tickets event-tickets allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects Event Tickets: from n/a through 5.30.0.1.
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Analysis
by VulDB Data Team • 10/08/2026
The identified security flaw represents a critical failure in access control mechanisms within the Liquid Web and StellarWP Event Tickets plugin, specifically affecting versions ranging from initial releases up to version 5.30.0.1. This vulnerability is classified as an Insecure Direct Object Reference or Broken Access Control issue, where the application fails to properly verify whether the authenticated user has sufficient privileges to perform specific actions on requested resources. The core technical flaw lies in the absence of robust server-side authorization checks for certain administrative functions and data manipulation endpoints. Consequently, any user with a valid account, regardless of their assigned role or permission level within the WordPress environment, can potentially interact with restricted features intended exclusively for administrators or editors. This misconfiguration allows attackers to bypass standard security boundaries by directly invoking API endpoints or form submissions that should be gated behind higher privilege levels.
From an operational perspective, this vulnerability enables unauthorized users to manipulate event data, modify ticket configurations, and access sensitive information that is not meant to be public or accessible to lower-tier roles such as subscribers or contributors. The impact extends beyond simple data exposure; it allows for the potential alteration of critical business logic related to event scheduling, pricing structures, and attendee management. An attacker could exploit this flaw to create fraudulent events, change ticket prices arbitrarily, or delete existing registrations, thereby disrupting the integrity of the platform's core functionality. In environments where multiple users manage different aspects of an organization's events, this lack of strict role-based access control undermines trust in the system and can lead to significant financial loss and reputational damage if malicious changes are propagated without detection.
This vulnerability aligns with Common Weakness Enumeration (CWE) ID 862, which describes Missing Authorization, indicating that the software does not perform an authorization check when an actor attempts to access a resource or perform an action. Furthermore, it maps directly to MITRE ATT&CK technique T1078, specifically Valid Accounts and potentially T1098 if used for persistent unauthorized access by modifying account permissions. The exploitation typically involves crafting HTTP requests that target specific endpoints associated with event management features while omitting the necessary authorization tokens or session checks required for elevated privileges. Since WordPress plugins often rely on capability checks during form processing and AJAX calls, a failure to enforce these checks at every entry point creates a predictable attack surface for automated scanning tools and manual exploitation attempts.
To mitigate this risk, immediate action is required by upgrading the Event Tickets plugin to version 5.30.0.2 or later, where the access control logic has been corrected to properly validate user permissions before executing sensitive operations. Administrators should also implement a Web Application Firewall (WAF) with rules designed to detect and block anomalous requests that attempt to access administrative endpoints without proper authentication headers. Regular security audits focusing on role-based access controls are recommended to ensure no other plugins or custom code introduce similar weaknesses. Additionally, enforcing strict least-privilege principles for all user accounts ensures that even if a vulnerability is present, the potential blast radius of exploitation is minimized by limiting what lower-level users can interact with within the application environment.