Modern Events Calendar lite < 7.1.0 - Authenticated (Admin+) Stored Cross-Site Scripting

4.4
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE CVE-2023-4021
CVSS 4.4 (Medium)
Publicly Published September 28, 2023
Last Updated January 22, 2024
Researcher Marco Wotschka - Wordfence

Description

The Modern Events Calendar lite plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Google API key and Calendar ID in versions up to, but not including, 7.1.0 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with administrator-level permissions and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This only affects multi-site installations and installations where unfiltered_html has been disabled.

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

References

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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 7.1.0, or a newer patched version
Affected Version
  • < 7.1.0
Patched Version
  • 7.1.0

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 < 6.10.5 - Authenticated (Admin+) Stored Cross-Site Scripting CVE-2023-1400 4.4 Pavak Tiwari March 14, 2023
7 Modern Events Calendar Lite <= 6.2.9 - Authenticated (Contributor+) Cross-Site Scripting CVE-2022-30533 6.4 Tsutomu Aramaki June 1, 2022
8 Modern Events Calendar Lite <= 6.5.1 - Authenticated (Admin+) Stored Cross-Site Scripting CVE-2022-27848 5.5 Muhammad Daffa April 14, 2022
9 Modern Events Calendar Lite <= 6.3.0 - Stored Cross-Site Scripting CVE-2022-0364 6.4 Rohan Chaudhari February 28, 2022
10 Modern Events Calendar Lite <= 6.1.6 - Subscriber+ Category Add Leading to Stored Cross-Site Scripting CVE-2021-25046 5.4 Krzysztof Zając December 3, 2021

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