Modern Events Calendar Lite <= 5.16.4 - Authenticated Stored Cross-Site Scripting

6.4
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE CVE-2021-24147
CVSS 6.4 (Medium)
Publicly Published January 29, 2021
Last Updated December 5, 2022
Researcher Nguyen Van Khanh

Description

Unvalidated input and lack of output encoding in the Modern Events Calendar Lite WordPress plugin, versions before 5.16.5, did not sanitise the mic_comment field (Notes on time) when adding/editing an event, allowing users with privilege as low as author to add events with a Cross-Site Scripting payload in them, which will be triggered in the frontend when viewing the event.

Learn more about Cross-Site Scripting vulnerabilities and how to prevent them.

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Vulnerability Details for Modern Events Calendar Lite

Software Type Plugin
Software Slug modern-events-calendar-lite
Patched? Yes
Remediation Update to version 5.16.5, or a newer patched version
Affected Version
  • <= 5.16.4
Patched Version
  • 5.16.5

Recent vulnerabilities in Modern Events Calendar Lite

# Title CVE ID CVSS Researchers Date
1 Modern Events Calendar (Lite & Pro) <= 7.33.0 - Unauthenticated SQL Injection CVE-2026-11349 7.5 Anthony Cihan June 29, 2026
2 Modern Events Calendar Lite <= 6.3.0 - Unauthenticated SQL Injection CVE-2021-4458 5.9 July 11, 2025
3 Modern Events Calendar <= 7.21.9 - Information Exposure CVE-2025-5733 5.3 Abdullah Shittu June 5, 2025
4 Modern Events Calendar <= 7.12.1 - Authenticated (Subscriber+) Server Side Request Forgery CVE-2024-6522 8.5 Foxyyy August 6, 2024
5 Modern Events Calendar <= 7.11.0 - Authenticated (Subscriber+) Arbitrary File Upload CVE-2024-5441 8.8 Foxyyy July 8, 2024
6 Modern Events Calendar lite < 7.1.0 - Authenticated (Admin+) Stored Cross-Site Scripting CVE-2023-4021 4.4 Marco Wotschka September 28, 2023
7 Modern Events Calendar lite < 6.10.5 - Authenticated (Admin+) Stored Cross-Site Scripting CVE-2023-1400 4.4 Pavak Tiwari March 14, 2023
8 Modern Events Calendar Lite <= 6.2.9 - Authenticated (Contributor+) Cross-Site Scripting CVE-2022-30533 6.4 Tsutomu Aramaki June 1, 2022
9 Modern Events Calendar Lite <= 6.5.1 - Authenticated (Admin+) Stored Cross-Site Scripting CVE-2022-27848 5.5 Muhammad Daffa April 14, 2022
10 Modern Events Calendar Lite <= 6.3.0 - Stored Cross-Site Scripting CVE-2022-0364 6.4 Rohan Chaudhari February 28, 2022

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