What’s Vulnerable › Vulnerabilities

CVE-2026-8151: Simple Membership MailChimp Integration < 1.9.8 - API Key Update via CSRF

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-02 · updated 2026-09-03
• Weakness: CWE-352

Description

The Simple Membership MailChimp Integration WordPress plugin before 1.9.8 does not have CSRF checks in its settings page, allowing attackers to trick a logged-in administrator into changing the configured third-party API key. Once replaced, all subsequent member registration data (name, email, membership level) is sent to the attacker-controlled account.

Affected products

• Simple Membership MailChimp Integration: before 1.9.8 — fixed in 1.9.8

How to fix

Upgrade to a fixed version: Simple Membership MailChimp Integration 1.9.8. Check the vendor advisory for mitigations.

References

• https://plugins.trac.wordpress.org/browser/simple-membership-mailchimp-integration/trunk/swpm-mailchimp-admin-menu.php#L12
• https://wpscan.com/vulnerability/c7002cf8-83db-4e1f-a6e9-230293290635/

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