CVE-2024-29912 in iCalendrier Plugin
Summary
by MITRE • 03/27/2024
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Baptiste Placé iCalendrier allows Stored XSS.This issue affects iCalendrier: from n/a through 1.80.
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Analysis
by VulDB Data Team • 04/12/2025
The vulnerability identified as CVE-2024-29912 represents a critical cross-site scripting flaw within the Baptiste Placé iCalendrier web application, specifically categorized under CWE-79 Improper Neutralization of Input During Web Page Generation. This stored cross-site scripting vulnerability arises from inadequate input validation and sanitization mechanisms within the application's web page generation process, creating a persistent security weakness that allows attackers to inject malicious scripts into web pages viewed by other users. The vulnerability affects all versions of iCalendrier from the initial release through version 1.80, indicating a long-standing issue that has remained unaddressed in the software's development lifecycle.
The technical exploitation of this vulnerability occurs when user-supplied input containing malicious script code is stored within the application's database or storage mechanisms and subsequently retrieved during web page generation without proper sanitization. When other users access pages containing this stored malicious content, their browsers execute the injected scripts, potentially leading to session hijacking, credential theft, or unauthorized actions performed on behalf of the victim. The stored nature of this XSS vulnerability means that the malicious payload persists even after the initial injection, making it particularly dangerous as it can affect multiple users over extended periods without requiring repeated exploitation attempts.
From an operational perspective, this vulnerability poses significant risks to organizations relying on iCalendrier for calendar management and scheduling functions, as it can compromise the security of user sessions and potentially lead to unauthorized access to sensitive calendar data. The impact extends beyond simple script execution to include potential data exfiltration, modification of calendar entries, and establishment of persistent backdoors within the application environment. Attackers can leverage this vulnerability to escalate privileges, perform unauthorized actions, and maintain access to systems through the compromised calendar application, making it a particularly attractive target for advanced persistent threats.
Mitigation strategies for CVE-2024-29912 should prioritize immediate implementation of input validation and output encoding mechanisms to prevent malicious script injection. Organizations should implement proper sanitization of all user inputs before storage and ensure that all generated web content properly escapes special characters to prevent script execution. The recommended approach includes applying the latest available security patches from the vendor, implementing Content Security Policy headers to restrict script execution, and conducting thorough input validation at multiple layers of the application architecture. Additionally, regular security testing including automated vulnerability scanning and manual penetration testing should be performed to identify similar weaknesses in the application's codebase. The remediation process should follow established security frameworks such as those recommended by the Open Web Application Security Project and align with ATT&CK framework techniques for web application attacks, specifically focusing on mitigating stored XSS vulnerabilities through proper input sanitization and output encoding practices.