CVE-2023-6242 in EventON Plugin
Summary
by MITRE • 01/11/2024
The EventON - WordPress Virtual Event Calendar Plugin plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 4.5.4 (for Pro) & 2.2.7 (for Free). This is due to missing or incorrect nonce validation on the evo_eventpost_update_meta function. This makes it possible for unauthenticated attackers to update arbitrary post metadata via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.
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Analysis
by VulDB Data Team • 04/11/2026
The EventON WordPress plugin presents a critical cross-site request forgery vulnerability that affects both its premium and free versions through specific release numbers. This vulnerability stems from inadequate nonce validation mechanisms within the evo_eventpost_update_meta function, which serves as a critical security control for validating legitimate administrative actions. The flaw exists across all versions up to and including 4.5.4 for the Pro edition and 2.2.7 for the Free edition, indicating a widespread issue that has remained unaddressed for an extended period. The vulnerability operates under CWE-352, which categorizes cross-site request forgery flaws as a fundamental web application security weakness that allows attackers to perform unauthorized actions on behalf of authenticated users. This particular implementation fails to properly validate the authenticity of requests submitted through the plugin's administrative interface, creating a pathway for malicious actors to manipulate event calendar metadata without proper authorization.
The operational impact of this vulnerability extends beyond simple data modification, as it enables attackers to manipulate critical event information that could affect website functionality and user experience. An attacker need only convince a site administrator to click on a malicious link or visit a compromised website containing the forged request, making this attack vector particularly dangerous due to its reliance on social engineering rather than technical exploitation. The forged requests can update arbitrary post metadata, potentially allowing attackers to modify event details, change scheduling information, or manipulate other critical calendar data that administrators rely on for managing virtual events. This vulnerability directly maps to ATT&CK technique T1531 which describes the use of modified or replaced binaries and system components to gain persistent access or manipulate data. The lack of proper nonce validation creates a persistent security gap that remains exploitable until the plugin is updated to include proper authentication checks.
Administrators and security teams should prioritize immediate remediation of this vulnerability by updating to the latest plugin versions where nonce validation has been properly implemented. The recommended mitigation strategy involves ensuring that all administrative actions within the EventON plugin require proper nonce verification before processing any metadata updates. Organizations should also implement additional security measures such as monitoring for unusual administrative activity, implementing role-based access controls, and conducting regular security audits of installed WordPress plugins. The vulnerability demonstrates the importance of proper input validation and authentication mechanisms within web applications, particularly in plugins that handle user-generated content or administrative functions. Security best practices dictate that all administrative endpoints should validate nonces or similar authentication tokens to prevent unauthorized modifications to critical system data, as outlined in OWASP Top Ten category A05:2021 - Security Misconfiguration and the broader principles of secure web application development.