Unauthenticated AJAX Signature Forgery in MonsterInsights Plugin by WordPress
CVE-2026-11366

Currently unrated

Key Information:

Vendor

WordPress
Status
Monsterinsights
Vendor
CVE Published:
4 August 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-11366?

The MonsterInsights plugin for WordPress before version 11.1.0 is vulnerable to a security flaw that allows unauthenticated attackers to bypass validation checks on an unauthenticated AJAX action. When the plugin is not connected to Google Analytics, the HMAC signing key is empty, which enables attackers to forge signatures and alter configuration settings. This can lead to disruptions in server-side analytics functions, particularly in Manual GA4 mode, allowing for unauthorized manipulation of analytics data.

Affected Version(s)

MonsterInsights 0 < 11.1.0

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-2026-11366 - Proof of Concept

References

https://wpscan.com/vulnerability/283331ca-cc2e-4c2c-9e3b-...
exploitvdb-entrytechnical-description

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Đặng Tiến Dũng
WPScan
.