properfraction Paid Membership Plugin, Ecommerce, User Registration Form, Login Form, User Profile & Restrict Content Plugin code injection

Summaryinfo

A vulnerability marked as critical has been reported in properfraction Paid Membership Plugin, Ecommerce, User Registration Form, Login Form, User Profile & Restrict Content Plugin up to 4.16.11 on WordPress. The affected element is an unknown function. Performing a manipulation results in code injection. This vulnerability is reported as CVE-2026-3309. The attack is possible to be carried out remotely. No exploit exists.

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. This affects an unknown code. The manipulation with an unknown input leads to a code injection vulnerability. CWE is classifying the issue as CWE-94. The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

The Paid Membership Plugin, Ecommerce, User Registration Form, Login Form, User Profile & Restrict Content – ProfilePress plugin for WordPress is vulnerable to arbitrary shortcode execution in all versions up to, and including, 4.16.11. This is due to the plugin allowing user-supplied billing field values from the checkout process to be interpolated into shortcode template strings that are subsequently processed without proper sanitization of shortcode syntax. This makes it possible for unauthenticated attackers to execute arbitrary shortcodes by submitting crafted billing field values during the checkout process.

The weakness was disclosed by Nabil Irawan. The advisory is shared at wordfence.com. This vulnerability is uniquely identified as CVE-2026-3309 since 02/26/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 04/05/2026). MITRE ATT&CK project uses the attack technique T1059 for this issue.

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-2026-18997). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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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If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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