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CVE-2026-77194

Simple Membership <= 4.8.1 - Unauthenticated Authentication Bypass to Administrator Account Takeover via Multisite Identity Binding

The Simple Membership plugin for WordPress is vulnerable to Authentication Bypass leading to Administrator Account Takeover in versions up to, and including, 4.8.0. This is due to improper identity verification during the public registration flow in WordPress Multisite environments, where the plugin binds new Simple Membership records to existing global WordPress users based solely on matching username and email, without requiring password verification or ownership proof, and fails to properly detect Administrator roles on child sites. This makes it possible for unauthenticated attackers to take over Administrator accounts on child sites in a Multisite network by registering a Simple Membership account with a victim's credentials on a site where public registration is enabled, then updating the victim's global WordPress password through the profile edit functionality. The vulnerability was partially patched in version 4.8.1.

CVSS 3.1 · 5.3 Medium EPSS < 1% KEV · Not listed
Vendors
Wordpress Wpinsider-1
Products
Wordpress Simple Membership
CVE-2026-14936

Simple Membership < 4.7.7 - Unauthenticated Payment Bypass via Missing PayPal IPN Receiver Verification

The Simple Membership WordPress plugin before 4.7.7 does not verify that a PayPal payment notification was sent to the site's own configured merchant account before activating a membership, allowing unauthenticated users to activate or extend a membership using a payment made to an arbitrary PayPal account they control.

CVSS 3.1 · 5.3 Medium EPSS < 1% KEV · Not listed
Vendors
Simple-membership-plugin Wordpress
Products
Simple Membership Wordpress
CVE-2026-15930

Simple Membership < 4.7.8 - Unauthenticated Administrator Account Takeover via Registration Username Collision

The Simple Membership WordPress plugin before 4.7.8 does not verify whether user creation failed during registration before using the returned value as a user ID to update an account, allowing unauthenticated attackers to overwrite the primary administrator's account data (including the email address) and take over that account through the password reset flow.

CVSS 3.1 · 9.4 Critical EPSS < 1% KEV · Not listed
Vendors
Simple-membership-plugin Wordpress
Products
Simple Membership Wordpress
CVE-2026-15931

Simple Membership < 4.7.8 - Unauthenticated Stored XSS via PayPal Subscription Subscriber Name

The Simple Membership WordPress plugin before 4.7.8 does not sanitise a subscriber name value received from an unauthenticated payment approval request, nor escape it when displaying it in the administration dashboard, allowing unauthenticated attackers to store arbitrary JavaScript that executes in an administrator's session.

CVSS 3.1 · 6.1 Medium EPSS < 1% KEV · Not listed
Vendors
Simple-membership-plugin Wordpress
Products
Simple Membership Wordpress
CVE-2026-12093

Simple Membership <= 4.7.5 - Missing Authorization to Unauthenticated Arbitrary Member Account Deactivation via Forged Stripe 'charge.refunded' Webhook

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.

CVSS 3.1 · 5.3 Medium EPSS < 1% KEV · Not listed
Vendors
Wordpress Wpinsider-1
Products
Wordpress Simple Membership
CVE-2026-24986

WordPress Simple Membership WP user Import plugin <= 1.9.1 - Cross Site Request Forgery (CSRF) vulnerability

Cross-Site Request Forgery (CSRF) vulnerability in wp.insider Simple Membership WP user Import simple-membership-wp-user-import allows Cross Site Request Forgery.This issue affects Simple Membership WP user Import: from n/a through <= 1.9.1.

CVSS 3.1 · 5.4 Medium EPSS < 1% KEV · Not listed
Vendors
Wordpress Wp.insider
Products
Wordpress Simple Membership Wp User Import
CVE-2026-25308

WordPress Simple Membership plugin <= 4.6.9 - Broken Access Control vulnerability

Missing Authorization vulnerability in wp.insider Simple Membership simple-membership allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects Simple Membership: from n/a through <= 4.6.9.

CVSS 3.1 · 4.3 Medium EPSS < 1% KEV · Not listed
Vendors
Wordpress Wp.insider
Products
Wordpress Simple Membership
CVE-2026-1461

Simple Membership <= 4.7.0 - Unauthenticated Improper Handling of Missing Values

The Simple Membership plugin for WordPress is vulnerable to Improper Handling of Missing Values in all versions up to, and including, 4.7.0 via the Stripe webhook handler. This is due to the plugin only validating webhook signatures when the stripe-webhook-signing-secret setting is configured, which is empty by default. This makes it possible for unauthenticated attackers to forge Stripe webhook events to manipulate membership subscriptions, including reactivating expired memberships without payment or canceling legitimate subscriptions, potentially leading to unauthorized access and service disruption.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
Vendors
Wordpress Wpinsider-1
Products
Wordpress Simple Membership
CVE-2024-3730

Simple Membership <= 4.4.3 - Authenticated(Contributor+) Stored Cross-Site Scripting via Shortcode

The Simple Membership plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's 'swpm_paypal_subscription_cancel_link' shortcode in all versions up to, and including, 4.4.3 due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

CVSS 3.1 · 5.4 Medium EPSS < 1% KEV · Not listed
Vendors
Simple-membership-plugin Wordpress
Products
Simple Membership Simple Membership