Description

The Simple Membership plugin for WordPress is vulnerable to authorization bypass in all versions up to, and including, 4.7.5. This is due to the plugin not properly verifying that a user is authorized to perform an action. This makes it possible for unauthenticated attackers to deactivate arbitrary member accounts by forging a charge.refunded webhook event containing a victim's subscription ID, setting the target member's account_state to 'inactive' and triggering cancellation hooks, transaction-record status changes, and cancellation notification emails. This vulnerability is exploitable only on installations where no Stripe webhook signing secret has been configured, which is the default out-of-the-box state; sites that have configured the stripe-webhook-signing-secret option are routed to the properly verified HMAC path and are not affected.

Weaknesses 1

References 10

• plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/simple-membership/tags/4.7.3/classes/class.swpm-wp-loaded-tasks.php#L96
• plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/simple-membership/tags/4.7.3/ipn/swpm-stripe-webhook-handler.php#L297
• plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/simple-membership/tags/4.7.3/ipn/swpm-stripe-webhook-handler.php#L71
• plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/simple-membership/tags/4.7.3/ipn/swpm_handle_subsc_ipn.php#L381
• plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/simple-membership/tags/4.7.4/classes/class.swpm-wp-loaded-tasks.php#L96
• plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/simple-membership/tags/4.7.4/ipn/swpm-stripe-webhook-handler.php#L297
• plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/simple-membership/tags/4.7.4/ipn/swpm-stripe-webhook-handler.php#L71
• plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/simple-membership/tags/4.7.4/ipn/swpm_handle_subsc_ipn.php#L381
• plugins.trac.wordpress.org https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3573852%40simple-membership&new=3573852%40simple-membership&sfp_email=&sfph_mail=
• wordfence.com https://www.wordfence.com/threat-intel/vulnerabilities/id/2f91a7c3-ee0e-48e9-aa5f-dfc1160bbc09?source=cve

Remediation