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Attack Surface Analysis for wenchaod/fscalendar

Attack Surface: Cross-Site Scripting (XSS) via Event Data

  • Description: Injection of malicious JavaScript code into event data (titles, descriptions) displayed on the calendar.
  • FSCalendar Contribution: FSCalendar provides the display mechanism for event data. While it doesn't directly handle the content, its role in displaying the data makes it a crucial part of the attack vector if the application fails to sanitize the input.
  • Example: An attacker creates an event with the title: <script>alert('XSS');</script>. If this title is displayed without escaping, the JavaScript will execute when another user views the calendar, facilitated by FSCalendar's rendering.
  • Impact: Compromise of user accounts, session hijacking, data theft, website defacement, phishing attacks.
  • Risk Severity: Critical
  • Mitigation Strategies:
    • Developer: Implement robust HTML sanitization on all event data before it is used by FSCalendar. Use a well-vetted sanitization library (e.g., DOMPurify). Never trust user-supplied data.
    • Developer: Implement a strong Content Security Policy (CSP) to restrict script execution.

Attack Surface: Denial of Service (DoS) via Delegate/DataSource Overload

  • Description: Overwhelming the application by triggering excessive calls to FSCalendar's delegate or data source methods, or by providing large amounts of data to these methods.
  • FSCalendar Contribution: FSCalendar directly relies on delegate and data source methods for its functionality and customization. The design of these methods and how the application implements them directly impacts the vulnerability.
  • Example: If a FSCalendar delegate method performs a database query every time a date is selected, an attacker could rapidly select many dates, causing numerous database queries and potentially overwhelming the server.
  • Impact: Application slowdown, unresponsiveness, or complete unavailability.
  • Risk Severity: High
  • Mitigation Strategies:
    • Developer: Optimize FSCalendar delegate and data source methods for performance. Avoid expensive operations within these methods. Implement caching.
    • Developer: Implement rate limiting to restrict the frequency of calls to FSCalendar's delegate/data source methods.
    • Developer: Implement input validation on data passed to FSCalendar's delegate/data source methods.