CVE-2024-30561 in Appointment Calendar Plugin
Summary
by MITRE • 04/01/2024
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Scientech It Solution Appointment Calendar allows Reflected XSS.This issue affects Appointment Calendar: from n/a through 2.9.6.
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Analysis
by VulDB Data Team • 04/09/2025
The vulnerability identified as CVE-2024-30561 represents a critical cross-site scripting weakness within the Scientech It Solution Appointment Calendar application, specifically impacting versions ranging from unspecified initial release through 2.9.6. This reflected cross-site scripting vulnerability arises from inadequate input sanitization during web page generation processes, creating a pathway for malicious actors to inject and execute arbitrary script code within the context of victim browsers. The flaw manifests when user-supplied input parameters are directly incorporated into dynamically generated web content without proper validation or encoding mechanisms, thereby enabling attackers to craft malicious payloads that can be executed when other users view affected pages.
The technical implementation of this vulnerability stems from the application's failure to properly neutralize user input before incorporating it into HTML output, which aligns with CWE-79 - Improper Neutralization of Input During Web Page Generation. This weakness allows attackers to inject malicious scripts through parameters that are reflected back to users, making the attack vector particularly dangerous as it requires no persistent storage of malicious content. The reflected nature of the vulnerability means that the malicious script is immediately executed by the victim's browser when they access a specially crafted URL containing the malicious payload, typically through phishing emails or compromised web links.
From an operational perspective, this vulnerability presents significant security risks to organizations using the Appointment Calendar system, as it can lead to session hijacking, credential theft, data exfiltration, and potential lateral movement within affected networks. Attackers can exploit this weakness to steal user sessions, redirect victims to malicious sites, or inject malware delivery mechanisms. The impact extends beyond individual user compromise to potentially affect entire organizational systems, especially if the calendar application is used for business-critical scheduling and appointment management. The vulnerability's presence in multiple versions indicates a persistent flaw in the application's input handling mechanisms that requires immediate remediation.
Mitigation strategies for CVE-2024-30561 should prioritize immediate implementation of proper input validation and output encoding measures across all user-supplied parameters. Organizations should implement comprehensive content security policies, utilize proper HTML escaping for all dynamic content generation, and deploy web application firewalls to detect and block malicious payloads. The remediation approach should follow established security frameworks such as those outlined in the OWASP Top Ten and ATT&CK framework's T1566 - Phishing category, focusing on preventing initial compromise through robust input sanitization. Additionally, regular security assessments and code reviews should be implemented to identify similar vulnerabilities in other application components, ensuring that the fix addresses the root cause rather than merely patching symptoms. The solution should also include monitoring for exploitation attempts and maintaining up-to-date threat intelligence to proactively defend against emerging attack vectors targeting this specific weakness.