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

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CRITICAL

Modern Events Calendar Lite <= 6.3.0 - Unauthenticated SQL Injection

Published Jul 12, 2025

9.8

CRITICAL

CVSS 3.1

EPSS 0.38%

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

Vendor Webnus/ Product Modern Events Calendar Lite Default
unaffected
- Version
  0
  Status
  affected
  Constraints
  <=6.3.0

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

Webnus/

Modern Events Calendar Lite

unaffected

Version	Status	Constraints
0	affected	<=6.3.0

Remediation

No remediation recorded yet.

Weaknesses (1)

CWE-89

SQL Injection

References (3)

Link	Providers	Tags
https://euvd.enisa.europa.eu/vulnerability/EUVD-2021-34683		Advisory
https://plugins.trac.wordpress.org/changeset/2683727/modern-events-calendar-lite/trunk/app/libraries/render.php		Patch
https://www.wordfence.com/threat-intel/vulnerabilities/id/703ba736-5834-40f2-9cf6-a6a70a73e4d6?source=cve		Third Party Advisory