CVE-2026-103684 in Event Solution Plugin
Summary
by MITRE • 10/05/2026
Missing Authorization vulnerability in Arraytics WP Event Solution wp-event-solution allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects WP Event Solution: from n/a through 4.1.25.
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Analysis
by VulDB Data Team • 10/05/2026
The identified security flaw within the Arraytics WP Event Solution plugin, specifically affecting versions up to and including 4.1.25, represents a critical failure in access control mechanisms known as Missing Function Level Access Control or Broken Access Control. This vulnerability arises from an insufficient implementation of authorization checks on server-side endpoints that handle sensitive administrative functions or user-specific data operations. In a properly secured WordPress environment, the plugin should verify not only whether a user is authenticated but also whether they possess the specific privileges required to execute particular actions. The absence of these rigorous checks allows any actor with valid credentials, and potentially unauthenticated actors depending on the specific endpoint configuration, to bypass intended security boundaries. This misconfiguration effectively grants users access to functionalities that are reserved for higher-privileged roles such as administrators or event organizers, thereby undermining the fundamental principle of least privilege which is essential for maintaining system integrity in multi-user web applications.
From a technical perspective, this vulnerability enables attackers to perform actions outside their designated permission scope without triggering appropriate authentication failures or error messages. The operational impact is severe because it allows malicious users with low-level access, such as subscribers or contributors, to manipulate event data, modify settings, delete content, or potentially escalate privileges within the WordPress ecosystem. Since WordPress plugins often interact deeply with the core database and other system components, an attacker exploiting this flaw can alter critical configuration parameters, inject malicious scripts through compromised fields if input validation is also weak, or extract sensitive information stored in association with events. This lack of proper authorization control directly compromises the confidentiality, integrity, and availability of the application's data, leading to potential defacement, data theft, or complete compromise of the underlying web server environment depending on the specific capabilities exposed by the unsecured endpoints.
This type of vulnerability is formally categorized under CWE-269: Improper Privilege Management in common weakness enumerations, which highlights issues where a user can act with more privileges than intended. Furthermore, it aligns closely with MITRE ATT&CK technique T1078: Valid Accounts, as the exploitation relies on using legitimate credentials to access unauthorized resources rather than exploiting software bugs for initial entry. The attack vector typically involves crafting specific HTTP requests that target administrative endpoints while spoofing or omitting necessary authorization tokens or role-based checks. Defenders and administrators must recognize that relying solely on client-side validation is insufficient; server-side verification of user roles against every requested action is mandatory to prevent such bypasses.
To mitigate this vulnerability, immediate remediation involves upgrading the WP Event Solution plugin to a version released after 4.1.25 where these access control checks have been properly implemented and tested by the vendor. Until an update is available or if custom code modifications are necessary, administrators should implement strict server-side authorization logic for all exposed endpoints, ensuring that every request validates the user's role against a whitelist of allowed actions. Additionally, employing Web Application Firewalls can provide a layer of defense by detecting anomalous requests targeting administrative paths from non-administrator IP addresses or sessions. Regular security audits and penetration testing focusing on access control flows are recommended to identify similar misconfigurations across other plugins installed within the WordPress environment, ensuring that no single point of failure compromises the entire application's security posture.