thimpress LearnPress Plugin up to 4.4.10 on WordPress Checkout AJAX Action LP_Session_Handler::get checkout-email deserialization

Summaryinfo

A vulnerability was found in thimpress LearnPress Plugin up to 4.4.10. It has been rated as critical. Impacted is the function LP_Session_Handler::get of the component Checkout AJAX Action. The manipulation of the argument checkout-email leads to deserialization. This vulnerability is uniquely identified as CVE-2026-104736. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability was found in thimpress LearnPress Plugin up to 4.4.10 and classified as critical. This issue affects the function LP_Session_Handler::get of the component Checkout AJAX Action. The manipulation of the argument checkout-email with an unknown input leads to a deserialization vulnerability. Using CWE to declare the problem leads to CWE-502. The product deserializes untrusted data without sufficiently verifying that the resulting data will be valid. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

The LearnPress plugin for WordPress is vulnerable to PHP Object Injection in versions up to, and including, 4.4.10 via deserialization of untrusted input from the 'checkout-email' request parameter during the checkout AJAX action. The value is passed through sanitize_text_field(), which does not strip serialized object syntax, then stored in the LearnPress session table and later fed to LP_Helper::maybe_unserialize() → unserialize() (without an allowed_classes restriction) by LP_Session_Handler::get() on subsequent requests. This makes it possible for unauthenticated attackers to inject a PHP Object.

It is possible to read the advisory at wordfence.com. The identification of this vulnerability is CVE-2026-104736 since 10/02/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 10/17/2026).

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

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

• WordPress Plugin

Vendor

• thimpress

Name

• LearnPress Plugin

Version

• 4.4.0
• 4.4.1
• 4.4.2
• 4.4.3
• 4.4.4
• 4.4.5
• 4.4.6
• 4.4.7
• 4.4.8
• 4.4.9
• 4.4.10

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

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