wpinsider-1 Simple Membership Plugin up to 4.8.3 on WordPress Email Activation check_and_do_email_activation email information disclosure

Summaryinfo

A vulnerability described as problematic has been identified in wpinsider-1 Simple Membership Plugin up to 4.8.3. This affects the function SwpmInitTimeTasks::check_and_do_email_activation of the component Email Activation. Executing a manipulation of the argument email can lead to information disclosure. This vulnerability appears as CVE-2026-97337. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability was found in wpinsider-1 Simple Membership Plugin up to 4.8.3. It has been declared as problematic. This vulnerability affects the function SwpmInitTimeTasks::check_and_do_email_activation of the component Email Activation. The manipulation of the argument email with an unknown input leads to a information disclosure vulnerability. The CWE definition for the vulnerability is CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. As an impact it is known to affect confidentiality. CVE summarizes:

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.

The advisory is available at wordfence.com. This vulnerability was named CVE-2026-97337 since 09/24/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 10/03/2026). This vulnerability is assigned to T1592 by the MITRE ATT&CK project.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• WordPress Plugin

Vendor

• wpinsider-1

Name

• Simple Membership Plugin

Version

• 4.8.0
• 4.8.1
• 4.8.2
• 4.8.3

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CPE 2.2info

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