What is CVE-2021-4458?

CVE-2021-4458 is a medium-severity vulnerability in Webnus Modern Events Calendar Lite, classified under SQL Injection. CVSS score: 5.9/10. Published 2025-07-12.

How severe is CVE-2021-4458?

Medium severity. CVSS v3 base score is 5.9 out of 10.

SQL Injection in Webnus Modern Events Calendar Lite

CVE-2021-4458

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.

Vulnerability class: SQL Injection

EPSS: 0.004 (28.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N.

Affected products

Webnus Modern_events_calendar_lite
Webnus/ Modern Events Calendar Lite — versions 0

Weakness classification (CWE)

CWE-89 — SQL Injection

References

security@wordfence.com (Third Party Advisory)
security@wordfence.com (Patch)

Frequently asked questions

What is CVE-2021-4458?: CVE-2021-4458 is a medium-severity vulnerability in Webnus Modern Events Calendar Lite, classified under SQL Injection. CVSS score: 5.9/10. Published 2025-07-12.
How severe is CVE-2021-4458?: Medium severity. CVSS v3 base score is 5.9 out of 10.