CVE-2024-1780 in BizCalendar Plugin
Summary
by MITRE • 04/10/2024
The BizCalendar Web plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the 'tab' parameter in all versions up to, and including, 1.1.0.19 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link.
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Analysis
by VulDB Data Team • 04/07/2025
The BizCalendar Web plugin for WordPress represents a widely used calendar management solution that has been identified with a critical reflected cross-site scripting vulnerability designated as CVE-2024-1780. This vulnerability affects all versions up to and including 1.1.0.19, creating a significant security risk for WordPress installations that utilize this plugin. The flaw resides in the plugin's insufficient handling of user input, specifically within the 'tab' parameter that is processed through the web interface. The vulnerability stems from inadequate input sanitization mechanisms and improper output escaping routines that fail to properly validate or encode user-supplied data before it is rendered back to the browser.
The technical exploitation of this vulnerability occurs through reflected cross-site scripting attacks where an attacker crafts malicious URLs containing malicious script code within the 'tab' parameter. When an unsuspecting user clicks on such a crafted link and the malicious code is reflected back through the web application, the script executes within the user's browser context. This creates a persistent threat vector that can be leveraged for various malicious activities including session hijacking, credential theft, defacement of calendar content, or redirection to malicious websites. The vulnerability is particularly dangerous because it requires no authentication from the attacker, making it an ideal candidate for mass deployment through phishing campaigns or compromised websites.
The operational impact of CVE-2024-1780 extends beyond simple script execution, as it can enable attackers to manipulate calendar data, access user sessions, and potentially escalate privileges within the WordPress environment. The reflected nature of the vulnerability means that the malicious payload is not stored on the server but is instead reflected back to the user's browser through the application's response, making it difficult to detect through traditional security monitoring. This vulnerability aligns with CWE-79 which specifically addresses cross-site scripting flaws, and maps to attack techniques within the ATT&CK framework under T1566 for phishing and T1059 for command and scripting interpreter, demonstrating the multi-faceted attack surface this vulnerability creates for threat actors.
Organizations utilizing the BizCalendar plugin should immediately implement mitigations including updating to the latest available version that addresses this vulnerability, implementing web application firewalls to filter malicious input, and conducting thorough security audits of all WordPress installations. The recommended approach includes disabling the vulnerable plugin until a patched version is deployed, implementing strict input validation for all user-supplied parameters, and educating users about the dangers of clicking on suspicious links. Additionally, administrators should monitor their web server logs for suspicious activity patterns and consider implementing content security policies to prevent execution of unauthorized scripts. The vulnerability demonstrates the critical importance of regular security updates and proper input validation in web applications, particularly those handling user-facing interfaces where reflected XSS vulnerabilities can be exploited with minimal user interaction.