Lack of CSRF Protection in Simple Membership MailChimp Integration Plugin by WordPress
CVE-2026-8151

5.4MEDIUM

Key Information:

Vendor

WordPress
Status
Simple Membership Mailchimp Integration
Vendor
CVE Published:
2 September 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-8151?

The Simple Membership MailChimp Integration plugin for WordPress prior to version 1.9.8 lacks essential CSRF checks on its settings page. This deficiency allows attackers to exploit the vulnerability by tricking a logged-in administrator into altering the third-party API key. If successful, the attacker would reroute member registration data, including names, emails, and membership levels, to a malicious account controlled by the attacker. Thus, sensitive user information could be compromised, exposing both users and administrators to significant risks.

Affected Version(s)

Simple Membership MailChimp Integration 0 < 1.9.8

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-2026-8151 - Proof of Concept

References

https://wpscan.com/vulnerability/c7002cf8-83db-4e1f-a6e9-...
exploitvdb-entrytechnical-description
https://plugins.trac.wordpress.org/browser/simple-members...
patch

CVSS V3.1

Score:
5.4
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Mustafa Ahmed
WPScan
.