CVE-2026-66457 in Events Manager Plugin
Summary
by MITRE • 08/06/2026
Unauthenticated Cross Site Scripting (XSS) in Events Manager <= 7.4.1 versions.
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Analysis
by VulDB Data Team • 08/06/2026
The vulnerability under examination represents an unauthenticated cross site scripting flaw affecting Events Manager plugin versions up to and including 7.4.1. This type of security weakness allows attackers to inject malicious scripts into web pages viewed by other users without requiring authentication credentials or privileged access to the system. The vulnerability resides within the plugin's handling of user input data, particularly in event management functionalities where users can create, edit, or view event information through web interfaces.
The technical implementation of this XSS vulnerability stems from insufficient input validation and output sanitization mechanisms within the Events Manager plugin codebase. When users submit event details, including titles, descriptions, locations, or other metadata fields, the application fails to properly escape or filter special characters that could be interpreted as executable script code by web browsers. This lack of proper sanitization creates an attack surface where malicious actors can craft specially formatted input that gets rendered back to other users' browsers as executable JavaScript code rather than plain text. The vulnerability manifests across multiple input vectors including event creation forms, edit interfaces, and potentially even in administrative panels where event data is displayed.
The operational impact of this vulnerability extends beyond simple script execution, as it enables attackers to perform various malicious activities such as session hijacking, credential theft, redirection to malicious sites, or data exfiltration from authenticated users who view compromised event pages. An attacker could craft an event with malicious JavaScript embedded in its description field that would execute whenever any user visits the event page, potentially stealing cookies, modifying page content, or redirecting users to phishing sites. The unauthenticated nature of this vulnerability means that attackers do not require valid accounts or elevated privileges to exploit it, making it particularly dangerous for websites where event data is publicly accessible or where administrators may inadvertently click on malicious links within event descriptions.
Security implications align with CWE-79 which classifies cross site scripting as a common weakness in web applications, specifically addressing the improper neutralization of input during web page generation. The vulnerability also maps to several ATT&CK techniques including T1566 for social engineering through malicious web content and T1071 for application layer protocols used for command and control communications. Organizations running affected versions should immediately implement mitigations such as input validation, output encoding, and Content Security Policy implementations to prevent script execution. The recommended solution involves updating to Events Manager version 7.4.2 or later, which includes proper sanitization of user inputs and enhanced security measures to prevent XSS injection attacks. Additionally, administrators should consider implementing web application firewalls, regular security audits, and input validation rules that specifically target script injection attempts in all user-contributed content areas of the website.