TI-2021-03314 Aliases CVE-2021-4458 GHSA-gcj4-979g-33cw

Modern Events Calendar Lite <= 6.3.0 - Unauthenticated SQL Injection

MEDIUM 42CWE-89Published 2025-07-12 · Updated 2026-04-08

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: SQL injection
Confidentiality · integrity · availability: High · High · High
Fix status: No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-89.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.004 34th percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Webnus	Modern Events Calendar Lite	up to 6.3.0	—	No fix listed	CNA

Modern Events Calendar Lite VendorWebnus Affected up to 6.3.0 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:webnus:modern_events_calendar_lite::::::wordpress::*	before 6.4.0	Vulnerable	Webnus

cpe:2.3:a:webnus:modern_events_calendar_lite:*:*:*:*:*:wordpress:*:* Versions before 6.4.0 Vulnerable ·Webnus

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2021-4458
2026-10-03 Alias added: GHSA-gcj4-979g-33cw

References

Patch 1

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

Advisory 1

https://www.wordfence.com/threat-intel/vulnerabilities/id/703ba736-5834-40f2-9cf6-a6a70a73e4d6?source=cve

TI-2021-07225 Modern Events Calendar < 6.1.5 - Unauthenticated Blind SQL Injection CVSS 3.1CRITICAL 9.8
TI-2021-06437 Modern Events Calendar Lite < 5.16.5 - Authenticated Arbitrary File Upload leading to RCE CVSS 3.1HIGH 7.2
TI-2022-00289 Modern Events Calendar Lite < 6.4.0 - Contributor+ Stored Cross Site Scripting CVSS 3.1MEDIUM 5.4
TI-2021-06438 Modern Events Calendar Lite < 5.16.5 - Unauthenticated Events Export CVSS 3.1HIGH 7.5
TI-2023-01324 Modern Events Calendar lite < 6.5.2 - Admin+ Stored XSS CVSS 3.1MEDIUM 4.8
TI-2024-05057 Modern Events Calendar <= 7.11.0 - Authenticated (Subscriber+) Arbitrary File Upload CVSS 3.1HIGH 8.8

See all 17 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences