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CVE-2025-62240: The Calendar That Cancelled Security: Deep Dive into CVE-2025-62240

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The Calendar That Cancelled Security: Deep Dive into CVE-2025-62240

Vulnerability ID: CVE-2025-62240
CVSS Score: 5.4
Published: 2025-10-09

A critical Stored Cross-Site Scripting (XSS) vulnerability in Liferay Portal's Calendar module turns mundane meeting invites into weaponized payloads. By neglecting to sanitize user names within the calendar resource JSON serialization, the application allows attackers to execute arbitrary JavaScript in the browser of any user—including administrators—who views the schedule.

TL;DR

Stored XSS in Liferay Portal Calendar (CVE-2025-62240) allows attackers to inject malicious scripts into their profile names. These scripts execute when other users view calendar events, potentially leading to session hijacking and account takeover.

⚠️ Exploit Status: POC

Technical Details

  • CWE ID: CWE-79
  • Attack Vector: Network
  • CVSS v3.1: 5.4 (Medium)
  • CVSS v4.0: 4.8 (Medium)
  • Privileges Required: Low (User)
  • Impact: Session Hijacking / Potential RCE

Affected Systems

  • Liferay Portal 7.4.3.35 - 7.4.3.111
  • Liferay DXP 2023.Q4.0 - 2023.Q4.5
  • Liferay DXP 2023.Q3.1 - 2023.Q3.7
  • Liferay DXP 7.4 Update 35 - 92
  • Liferay DXP 7.3 Update 25 - 36
  • Liferay Portal: 7.4.3.35 - 7.4.3.111 (Fixed in: 7.4.3.112)
  • Liferay DXP: 7.4 Update 35 - 92 (Fixed in: Update 93)

Code Analysis

Commit: 961b569

SF-00000000: Use HtmlUtil.escape for calendar resource name

return HtmlUtil.escape(
    calendarResource.getName(themeDisplay.getLocale()));
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Exploit Details

  • Theoretical: Standard Stored XSS payload injection via User Profile fields.

Mitigation Strategies

  • Output Encoding: Ensure all user-controlled data is escaped before JSON serialization.
  • Content Security Policy (CSP): Implement strict CSP headers to restrict script execution sources.
  • Input Validation: sanitize user profile fields (First/Last Name) to reject special characters.

Remediation Steps:

  1. Identify the current version of 'com.liferay.calendar.web' module.
  2. Apply Liferay Portal patch 7.4.3.112 or Liferay DXP Update 93.
  3. Verify the fix by attempting to save HTML tags in a user profile name and viewing the calendar.
  4. Audit existing user database entries for potential stored XSS payloads.

References

Read the full report for CVE-2025-62240 on our website for more details including interactive diagrams and full exploit analysis.

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