AJAX Vulnerability in The Events Calendar Plugin for WordPress
CVE-2026-84740

6.5MEDIUM

Key Information:

Vendor

WordPress
Status
The Events Calendar
Vendor
CVE Published:
2 October 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-84740?

The Events Calendar plugin for WordPress, in versions prior to 6.17.5.1, is prone to a vulnerability that allows unauthenticated users to submit data through an AJAX action without proper validation or sanitization. This can lead to unauthorized execution of arbitrary shortcodes registered on the site, posing significant security risks and potential exploitation of the site’s functionality.

Affected Version(s)

The Events Calendar 6.12.0 < 6.17.5.1

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-84740 - Proof of Concept

References

https://wpscan.com/vulnerability/3381a51e-beaa-4420-a33b-...
exploitvdb-entrytechnical-description

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Jakub Herman
WPScan
.