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Vulnerabilities

Vulnerability · CVE-2021-4458

webnus modern_events_calendar_lite Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')

Published Jul 12, 2025 · catalog updated Apr 8, 2026 · Modern Events Calendar Lite

Patch now

CVE-2021-4458 is in the CISA known-exploited catalog. Confirm Modern Events Calendar Lite against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Severity
Medium5.9
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
0.40%
Remediation
Remediation guidance
Affected products
stated modern_events_calendar_lite · vendor webnus modern_events_calendar_lite · vendor webnus/ Modern Events Calendar Lite 0 ≤6.3.0

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • stated modern_events_calendar_lite<= 6.3.0
  • vendor webnus modern_events_calendar_liteversion unspecified
  • vendor webnus/ Modern Events Calendar Lite 0 ≤6.3.00 ≤6.3.0

How to fix CVE-2021-4458

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2021-4458 is in the CISA known-exploited catalog. Confirm Modern Events Calendar Lite against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Compare what you have installed with webnus/ Modern Events Calendar Lite 0 ≤6.3.0 0 ≤6.3.0. Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

What should an analyst verify?

No weakness class is stored. EPSS 0.40%. The CISA KEV listing is the exploitation evidence. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

WordPress security

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Mar 10, 2026 · VulnCheck KEV

    Detected

    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

  2. Mar 10, 2026 · CISA KEV

    Known exploited

    Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

  3. Apr 8, 2026 · EUVD

    Updated

    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

Sources

  • CVE.orgVulnerability recordCVE-2021-4458

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2021-4458

    30-day exploitation probability 0.4%

    first.org
  • EUVDVulnerability recordEUVD-2021-34683

    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 suffici

    euvd.enisa.europa.eu
  • VulnCheck KEVConfirmed exploitationCVE-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 suffici

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 17, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.