CVE-2026-8151 Simple Membership CVE debrief

Who should care

Administrators of WordPress sites using the Simple Membership MailChimp Integration plugin should verify the integrity of the plugin settings and ensure that the API key has not been tampered with. Additionally, security teams and vulnerability management teams should be aware of this vulnerability and take steps to mitigate it. This includes reviewing the plugin's configuration, monitoring for suspicious activity related to member registration data, and updating the plugin to version 1.9.8 or later.

Technical summary

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. This could lead to unauthorized access to member registration data, including name, email, and membership level. The vulnerability has a CVSS score of 5.4 and a severity of MEDIUM. To mitigate this vulnerability, administrators should verify the integrity of the plugin settings and ensure that the API key has not been tampered with. Updating the plugin to version 1.9.8 or later is also recommended.

Defensive priority

Administrators should verify the integrity of the Simple Membership MailChimp Integration plugin settings and ensure that the API key has not been tampered with.

Recommended defensive actions

• Verify the integrity of the Simple Membership MailChimp Integration plugin settings.
• Ensure that the API key has not been tampered with.
• Update the plugin to version 1.9.8 or later.
• Monitor for suspicious activity related to member registration data.
• Review compensating controls for exposed systems while remediation is scheduled and verified.
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.
• Track exceptions, retest remediated assets, and close the item only after evidence is documented.

Evidence notes

The CVE record and NVD entry provide details about the vulnerability in the Simple Membership MailChimp Integration WordPress plugin. However, the evidence is limited, and further verification is needed to determine the full scope of the vulnerability. The plugin's lack of CSRF checks in its settings page allows attackers to trick a logged-in administrator into changing the configured third-party API key, potentially leading to unauthorized access to member registration data. To verify the integrity of the plugin settings, administrators should review the plugin's configuration and ensure that the API key has not been tampered with. Additionally, monitoring for suspicious activity related to member registration data is recommended.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.