What’s Vulnerable › Vulnerabilities

CVE-2021-4458: Modern Events Calendar Lite <= 6.3.0 - Unauthenticated SQL Injection

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-07-12 · updated 2026-06-17
• Weakness: CWE-89

Description

The Modern Events Calendar Lite plugin for WordPress is vulnerable to SQL Injection via the 'id' parameter of the 'wp_ajax_mec_load_single_page' AJAX action in all versions up to, and including, 6.3.0 due to insufficient escaping on the user supplied parameter and lack of sufficient preparation on the existing SQL query. This makes it possible for unauthenticated attackers to append additional SQL queries into already existing queries that can be used to extract sensitive information from the database. This is only exploitable on sites with addslashes disabled.

Affected products

• Modern Events Calendar Lite: before 6.4.0 — fixed in 6.4.0

How to fix

Upgrade to a fixed version: Modern Events Calendar Lite 6.4.0. Check the vendor advisory for mitigations.

References

• https://plugins.trac.wordpress.org/changeset/2683727/modern-events-calendar-lite/trunk/app/libraries/render.php
• https://www.wordfence.com/threat-intel/vulnerabilities/id/703ba736-5834-40f2-9cf6-a6a70a73e4d6?source=cve

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