PatchTheCVECVE-2021-4458: The Modern Events Calendar Lite plugin for WordPress is vulnerable to SQL Injection via the 'id' parameter of
CVE-2021-4458 is a medium-severity flaw (CVSS 5.9) affecting modern events calendar lite. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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 b
Why this priority
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 5.9 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | High |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.4% (top 66%) |
| CISA exploited list | No |
| Weakness | CWE-89 |
| Published | 2025-07-12 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2021-4458?
modern events calendar lite: upgrade to 6.4.0. Exact commands for each OS are on this page.
Is CVE-2021-4458 being exploited?
CVE-2021-4458 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2021-4458 affect?
CVE-2021-4458 affects modern events calendar lite. Severity is medium (CVSS 5.9). 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 use
How urgent is CVE-2021-4458?
Priority 34/100. Remotely exploitable, no login, no user action
Software pages
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