properfraction Paid Membership Plugin, Ecommerce, User Registration Form, Login Form, User Profile & Restrict Content Plugin process_checkout authorization

Summaryinfo

A vulnerability, which was classified as critical, was found in properfraction Paid Membership Plugin, Ecommerce, User Registration Form, Login Form, User Profile & Restrict Content Plugin up to 4.16.11 on WordPress. This affects the function process_checkout of the component User Registration Handler. The manipulation of the argument change_plan_sub_id results in authorization. This vulnerability was named CVE-2026-3445. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability was found in properfraction Paid Membership Plugin, Ecommerce, User Registration Form, Login Form, User Profile & Restrict Content Plugin up to 4.16.11 on WordPress. It has been classified as critical. Affected is the function process_checkout of the component User Registration Handler. The manipulation of the argument change_plan_sub_id with an unknown input leads to a authorization vulnerability. CWE is classifying the issue as CWE-862. The product does not perform an authorization check when an actor attempts to access a resource or perform an action. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

The Paid Membership Plugin, Ecommerce, User Registration Form, Login Form, User Profile & Restrict Content – ProfilePress plugin for WordPress is vulnerable to unauthorized membership payment bypass in all versions up to, and including, 4.16.11. This is due to a missing ownership verification on the `change_plan_sub_id` parameter in the `process_checkout()` function. This makes it possible for authenticated attackers, with subscriber level access and above, to reference another user's active subscription during checkout to manipulate proration calculations, allowing them to obtain paid lifetime membership plans without payment via the `ppress_process_checkout` AJAX action.

The weakness was presented by Supakiad S.. The advisory is shared for download at wordfence.com. This vulnerability is traded as CVE-2026-3445 since 03/02/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 04/04/2026).

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

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-18987). Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• E-Commerce Management Software

Vendor

• properfraction

Name

• Paid Membership Plugin, Ecommerce, User Registration Form, Login Form, User Profile & Restrict Content Plugin

Version

• 4.16.0
• 4.16.1
• 4.16.2
• 4.16.3
• 4.16.4
• 4.16.5
• 4.16.6
• 4.16.7
• 4.16.8
• 4.16.9
• 4.16.10
• 4.16.11

CPE 2.3info

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CPE 2.2info

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Once again VulDB remains the best source for vulnerability data.

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