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CVE-2026-88764

Simple Membership < 4.7.8 - Subscriber+ Membership Level Escalation via PayPal Standard subsc_ref

The Simple Membership WordPress plugin before 4.7.8 does not validate that the membership level supplied in a PayPal payment notification matches the level configured for the paid payment button, allowing members to pay for a lower-priced membership while being granted a higher, more privileged membership level.

CVSS 3.1 · 5.4 Medium EPSS < 1% KEV · Not listed
Vendors
Wordpress-extensions
Products
Simple Membership
CVE-2026-11855

Simple Membership < 4.7.5 - Unauthenticated Stored XSS via Stripe Webhook API Version

The Simple Membership WordPress plugin before 4.7.5 does not verify the authenticity of Stripe webhook requests when no signing secret is configured, nor escape a value taken from them before outputting it in an administrator notice, allowing unauthenticated attackers to inject arbitrary web scripts that execute in the context of a logged-in administrator.

CVSS 3.1 · 8.8 High EPSS < 1% KEV · Not listed
Vendors
Wordpress-extensions
Products
Simple Membership
CVE-2026-88785

Simple Membership < 4.8.3 - Newly Registered Member Password Disclosure via URL Query String

The Simple Membership WordPress plugin before 4.8.3 does not avoid transmitting a newly registered member's plaintext password in a URL query string when an optional auto-login-after-registration feature is enabled, exposing the credential in browser history and in web server, proxy, and CDN access logs to anyone able to read them.

CVSS 3.1 · 4.7 Medium EPSS < 1% KEV · Not listed
Vendors
Wordpress-extensions
Products
Simple Membership
CVE-2026-103427

Simple Membership <= 4.8.4 - Authenticated (Subscriber+) Stored Cross-Site Scripting via Country Field

The Simple Membership plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'country' parameter in all versions up to, and including, 4.8.4 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with subscriber-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. Unauthenticated attackers may also exploit this vulnerability when the plugin's Enable Free Membership feature is turned on, as it permits anonymous front-end registration and profile submission.

CVSS 3.1 · 6.4 Medium EPSS < 1% KEV · Not listed
Vendors
Wordpress-extensions Wpinsider-1
Products
Simple Membership Simple Membership
CVE-2026-97337

Simple Membership <= 4.8.3 - Missing Authorization to Unauthenticated Account Takeover and Sensitive Information Disclosure via 'email' Parameter on Activation Endpoints

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.

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Vendors
Wordpress-extensions Wpinsider-1
Products
Simple Membership Simple Membership