Modern Events Calendar Lite <= 5.16.4 — Authenticated Stored Cross-Site Scripting
CVE-2021-24147Published · Updated Action summary
Affected: ≤5.16.4Update to 5.16.5 or newer
All remediation steps- Severity
- Medium6.4
- CVSS
- 6.4CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:NWhat does this vector mean?
AV:NAttack vector- Network
AC:LAttack complexity- Low
PR:LPrivileges required- Low
UI:NUser interaction- None
S:CScope- Changed
C:LConfidentiality- Low
I:LIntegrity- Low
A:NAvailability- None
- Weakness
- CWE-79 Cross-Site Scripting
- Required access
- Unknown
- Exploit prediction (EPSS)
- No score
- CISA KEV
- Not listed
On this page8
Am I affected?
Modern Events Calendar Lite modern-events-calendar-lite
- Affected≤ 5.16.4
- Patched in5.16.5
Update to 5.16.5 or newer.
You are affected if you run ≤ 5.16.4. Version 5.16.5 and later are not affected by this issue.
- Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under Modern Events Calendar Lite.
- No admin access? Run a passive check of your site. It reads public files only.
What to do
- Update to version 5.16.5, or a newer patched version
- Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
- Watch Modern Events Calendar Lite to get an email when the next vulnerability is published.
Advisory
Source description from Wordfence Intelligence, credited to Nguyen Van Khanh.
Unvalidated input and lack of output encoding in the Modern Events Calendar Lite WordPress plugin, versions before 5.16.5, did not sanitise the mic_comment field (Notes on time) when adding/editing an event, allowing users with privilege as low as author to add events with a Cross-Site Scripting payload in them, which will be triggered in the frontend when viewing the event.
Exploits & references
Proof-of-concept & detection
No public proof-of-concept or detection template is known for this vulnerability.
Advisories & patches
- Advisorywordfence.com
Related CVEs
More in Modern Events Calendar Lite
All 26| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| Medium6.5 | Authenticated (Subscriber+) SQL Injection via mec_fes_csv_export <7.37.0Update to 7.37.0 | CVE-2026-96534 | |
| Medium6.5 | Authenticated (Subscriber+) SQL Injection <7.37.0Update to 7.37.0 | CVE-2026-102499 | |
| Medium4.3 | Authenticated (Subscriber+) Information Exposure ≤7.36.0Update to 7.37.0 | CVE-2026-110069 | |
| Medium4.3 | Authenticated (Subscriber+) Insecure Direct Object Reference ≤7.36.3Update to 7.36.4 | CVE-2026-110070 | |
| Medium6.5 | Authenticated (Subscriber+) SQL Injection ≤7.36.0Update to 7.37.0 | — |
- Medium6.5Authenticated (Subscriber+) SQL Injection via mec_fes_csv_export
<7.37.0Update to 7.37.0
- Medium6.5Authenticated (Subscriber+) SQL Injection
<7.37.0Update to 7.37.0
- Medium4.3Authenticated (Subscriber+) Information Exposure
≤7.36.0Update to 7.37.0
- Medium4.3Authenticated (Subscriber+) Insecure Direct Object Reference
≤7.36.3Update to 7.36.4
- Medium6.5Authenticated (Subscriber+) SQL Injection
≤7.36.0Update to 7.37.0
Same weakness (Cross-Site Scripting)
All Cross-Site Scripting| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| High7.2 | Unauthenticated Stored Cross-Site Scripting via Comment User-Agent Header | CVE-2026-120688 | |
| Critical9.8 | Unauthenticated Arbitrary File Upload via File Upload via Public Form Submission | CVE-2026-125055 | |
| Critical9.8 | Unauthenticated PHP Object Injection to Remote Code Execution via 'form' Parameter | CVE-2026-119077 | |
| Medium5.3 | Unauthenticated Sensitive Information Exposure in 'search' Parameter | CVE-2026-121518 |
- High7.2Unauthenticated Stored Cross-Site Scripting via Comment User-Agent Header
EZ SQL Reports Shortcode Widget and DB Backup
≤5.25.25Update to 5.26.45
- Critical9.8Unauthenticated Arbitrary File Upload via File Upload via Public Form Submission
Chatterbug Forms – Fast, Flexible WordPress Form Builder
≤1.0.2Update to 1.1
- Critical9.8Unauthenticated PHP Object Injection to Remote Code Execution via 'form' Parameter
ELEX WordPress HelpDesk & Customer Ticketing System
≤3.3.9Update to 3.4.0
- Medium5.3Unauthenticated Sensitive Information Exposure in 'search' Parameter
Customer Reviews for WooCommerce
≤5.127.0Update to 5.128.0
Timeline
CVE published
Severity medium, CVSS 6.4
Record last updated
Sources & licenses
Wordfence record- Vulnerability data
- Wordfence Intelligence. Copyright 2012-2026 Defiant Inc. Licensed under the CC BY-SA 4.0.
- CVE® identifiers
- Copyright 1999-2026 The MITRE Corporation. Used under the CVE Program. CVE® is a registered trademark of The MITRE Corporation.
- CVSS / CWE
- National Vulnerability Database (NVD), shown unmodified. This product uses the NVD API but is not endorsed or certified by the NVD.
- VulnCrest content
- Summary, remediation guidance and page layout © VulnCrest. Not sourced from NVD.