Vulnerability in wpinsider-1 Simple Membership

[ Description ]Official description

The Simple Membership plugin for WordPress is vulnerable to unauthorized modification of data and sensitive information disclosure in versions up to, and including, 4.8.3 via the resend-activation and email-activation endpoints. The endpoints are dispatched from SwpmInitTimeTasks::check_and_do_email_activation() on frontend init with no authentication, nonce, capability, or ownership check, and the recipient address used by SwpmRegistration::send_reg_email() is taken from an attacker-controlled $_POST['email'] parameter (overriding the member's registered address). This makes it possible for unauthenticated attackers to redirect an arbitrary pending member's activation email — and the follow-up 'registration complete' email containing the member's username and plaintext password — to an attacker-chosen address, and to then activate that member's account without their consent.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ References ]References

• plugins.trac.wordpress.org/browser/simple-membership/tags/4.8.3/classes/class.swpm-fron…
• plugins.trac.wordpress.org/browser/simple-membership/tags/4.8.3/classes/class.swpm-fron…
• plugins.trac.wordpress.org/browser/simple-membership/tags/4.8.3/classes/class.swpm-init…
• plugins.trac.wordpress.org/browser/simple-membership/tags/4.8.3/classes/class.swpm-regi…
• plugins.trac.wordpress.org/changeset
• www.wordfence.com/threat-intel/vulnerabilities/id/ae2b6c4c-7dd6-41e7-8b8d-c09aa7fa660b