CVE-2021-24149Public exploitNetwork attack vector

Authenticated SQL injection via unsanitized post ID

Published Mar 18, 2021 · Updated Aug 3, 2024

SQL injection in Webnus Modern Events Calendar Lite before 5.16.6 allows remote authenticated users to alter database queries. The mec_fes_form AJAX action inserts the unsanitized mec[post_id] POST value into an SQL query, permitting injected SQL syntax. Author-level access is normally required; a public Frontend Event Submission form exposes the verified time-based technique to authenticated subscribers.

CVSS severity8.8
High
EPSS probability1.50%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

SQL injection in Webnus Modern Events Calendar Lite before 5.16.6 allows remote authenticated users to alter database queries. The mec_fes_form AJAX action inserts the unsanitized mec[post_id] POST value into an SQL query, permitting injected SQL syntax. Author-level access is normally required; a public Frontend Event Submission form exposes the verified time-based technique to authenticated subscribers.

The record

CVE
CVE-2021-24149
Published
Mar 18, 2021
Updated
Aug 3, 2024
Vendor
Webnus
Product
Modern Events Calendar Lite
Classifications
CWE-89, CAPEC-7, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 18, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.16.6 <5.16.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Webnus · Modern Events Calendar Liteversion=5.16.6 <5.16.6

Published CVSS scores

6.5NIST NVDAV:N/AC:L/Au:S/C:P/I:P/A:P
8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.8WordfenceCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-89Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')
CAPEC-7Blind SQL Injection
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo