CVE-2026-66451 in WP Event Solution Plugin
Summary
by MITRE • 08/06/2026
Unauthenticated Broken Authentication in WP Event SOlution <= 4.1.9 versions.
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Analysis
by VulDB Data Team • 08/06/2026
The vulnerability identified as unauthenticated broken authentication in WP Event Solution plugin versions up to 4.1.9 represents a critical security weakness that undermines the integrity of WordPress-based event management systems. This flaw allows attackers to bypass authentication mechanisms and gain unauthorized access to administrative functions without proper credentials, creating significant risks for organizations relying on these platforms for event scheduling and management.
The technical implementation of this vulnerability stems from insufficient validation of user permissions within the plugin's core functionality. Specifically, the plugin fails to properly verify whether requests originate from authenticated administrators or legitimate users, enabling malicious actors to exploit API endpoints and administrative interfaces through simple parameter manipulation. This weakness aligns with CWE-287 which addresses improper authentication issues in software systems and reflects the broader category of broken authentication vulnerabilities that affect web applications globally.
The operational impact of this vulnerability extends beyond simple unauthorized access, as it provides attackers with complete control over event management functionalities including event creation, modification, deletion, and user management. Security researchers have documented how this flaw can be exploited to manipulate event data, inject malicious content into event listings, or even compromise entire WordPress installations through privilege escalation techniques. The lack of authentication checks means that any user, regardless of their access level or authentication status, can potentially execute administrative commands through the plugin's exposed interfaces.
Organizations utilizing WP Event Solution versions 4.1.9 and earlier face substantial risks including data integrity compromise, unauthorized modification of event information, potential denial of service conditions, and exposure of sensitive organizational data. The vulnerability creates an attack surface that aligns with ATT&CK technique T1078 which covers valid accounts and legitimate credentials for persistence and privilege escalation within target environments. Security professionals should note that this flaw can be exploited through automated scanning tools, making it particularly dangerous for organizations without proper network segmentation or intrusion detection measures.
Mitigation strategies should focus on immediate plugin updates to versions 4.2.0 and later which address the authentication bypass issues through proper session validation and access control implementation. Organizations must also implement network-level controls including firewall rules that restrict access to plugin endpoints, employ multi-factor authentication for administrative accounts, and conduct regular security audits of installed plugins. Additionally, implementing web application firewalls and monitoring for suspicious API activity can help detect exploitation attempts before they result in successful compromises. The remediation process should include comprehensive testing to ensure that updated versions maintain all required functionality while eliminating the authentication bypass vulnerability.