CVE-2021-4458

CRITICAL EPSS 27.3%
Published Jul 12, 202511mo ago · Modified Jun 17, 20261w ago
9.8 CVSS 3.1
Critical
Find Similar
Published Jul 12, 2025 11mo ago
Last Modified Jun 17, 2026 1w ago

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.

CVSS Details

Base Score
9.8
Exploitability
3.9
Impact
5.9
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
27.3% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-89 SQL Injection Injection

Affected Products 1

VendorProductVersionRange
webnusmodern_events_calendar_lite* <6.4.0

References 2

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

Remediation

  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/changeset/2683727/modern-events-calendar-lite/trunk/app/libraries/render.php
    Patch