Simple Membership MailChimp settings can be replaced through cross-site requests
Simple Membership MailChimp Integration before 1.9.8 does not use CSRF protection on its settings page. An attacker can trick a logged-in Administrator into replacing the configured MailChimp API key, causing later member names, email addresses, and membership levels to be sent to an attacker-controlled account.
- Component
- Simple Membership MailChimp Integration
- Plugin slug
simple-membership-mailchimp-integration- Affected
- < 1.9.8
- Safe version
1.9.8- Published
- Sep 02, 2026
This CVE was published Sep 02, 2026 and is one of 1 known issue for this plugin.
Update, patch or deactivate.
Update to 1.9.8 or later, rotate the MailChimp API key, verify the configured account, and assess member registrations sent while the setting was changed.
A safe version is available, so updating to that version or later is the preferred remediation. If an immediate update is not practical, consider a targeted application patch or temporarily restricting the affected functionality.
Deactivate only when warranted by your risk profile, or when advised by your hosting provider in the limited circumstances where the vulnerability cannot otherwise be mitigated. If you’re unsure which action is appropriate, contact Fused or your hosting provider for guidance.
Technical 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.
CVE / CNA vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N