CVE-2025-52133 in Mocca Calendar
Summary
by MITRE • 08/03/2025
The Mocca Calendar application before 2.15 for XWiki allows XSS via a title upon calendar import.
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Analysis
by VulDB Data Team • 08/03/2025
The vulnerability identified as CVE-2025-52133 affects the Mocca Calendar application version 2.14 and earlier within the XWiki platform ecosystem. This represents a cross-site scripting vulnerability that specifically manifests during the calendar import process when handling title parameters. The issue arises from insufficient input validation and output encoding mechanisms within the application's import functionality, creating a pathway for malicious actors to inject arbitrary script code into the calendar title field.
The technical flaw resides in the application's failure to properly sanitize user-supplied title data during calendar import operations. When users import calendar events, the system accepts title values without adequate filtering or encoding, allowing special characters and script tags to persist in the application's data storage and subsequent rendering. This vulnerability falls under the CWE-79 category of Cross-Site Scripting, specifically manifesting as reflected XSS in the context of calendar data import. The attack vector requires an authenticated user to perform the calendar import action, making it a user-initiated privilege escalation vulnerability.
The operational impact of this vulnerability extends beyond simple script injection, potentially enabling attackers to perform session hijacking, defacement of calendar content, or redirection to malicious sites. An attacker could craft a malicious title containing javascript code that executes in the context of other users' browsers when they view the imported calendar events. This could lead to unauthorized access to calendar data, modification of event information, or even the execution of malicious payloads that could compromise the broader XWiki platform. The vulnerability affects the confidentiality, integrity, and availability of calendar data within the application.
Mitigation strategies should focus on implementing comprehensive input validation and output encoding mechanisms for all user-supplied data, particularly during import operations. The application should employ proper HTML escaping and sanitization techniques before storing or rendering any user-provided title content. Additionally, input length restrictions and character set validation should be implemented to prevent malicious data injection. Organizations should also consider implementing content security policies and regular security scanning of calendar import functionality. The fix should align with the CWE-79 remediation guidelines and follow the ATT&CK framework's mitigation strategies for web application vulnerabilities. System administrators should upgrade to version 2.15 or later where this vulnerability has been addressed through proper input sanitization and output encoding controls.