Sylius PayPalPlugin up to 1.6.0/1.7.0/2.0.0 Shopping Cart external control of assumed-immutable web parameter

Summaryinfo

A vulnerability was found in Sylius PayPalPlugin up to 1.6.0/1.7.0/2.0.0. It has been declared as problematic. Affected is an unknown function of the component Shopping Cart Handler. Executing a manipulation can lead to external control of assumed-immutable web parameter. The identification of this vulnerability is CVE-2025-29788. The attack may be launched remotely. There is no exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in Sylius PayPalPlugin up to 1.6.0/1.7.0/2.0.0. It has been declared as problematic. This vulnerability affects some unknown processing of the component Shopping Cart Handler. The manipulation with an unknown input leads to a external control of assumed-immutable web parameter vulnerability. The CWE definition for the vulnerability is CWE-472. The web application does not sufficiently verify inputs that are assumed to be immutable but are actually externally controllable, such as hidden form fields. As an impact it is known to affect integrity. CVE summarizes:

The Syliud PayPal Plugin is the Sylius Core Team’s plugin for the PayPal Commerce Platform. A vulnerability in versions prior to 1.6.1, 1.7.1, and 2.0.1 allows users to manipulate the final payment amount processed by PayPal. If a user modifies the item quantity in their shopping cart after initiating the PayPal Express Checkout process, PayPal will not receive the updated total amount. As a result, PayPal captures only the initially transmitted amount, while Sylius incorrectly considers the order fully paid based on the modified total. This flaw can be exploited both accidentally and intentionally, potentially enabling fraud by allowing customers to pay less than the actual order value. Attackers can intentionally pay less than the actual total order amount, business owners may suffer financial losses due to underpaid orders, and integrity of payment processing is compromised. The issue is fixed in versions 1.6.1, 1.7.1, 2.0.1, and above. To resolve the problem in the end application without updating to the newest patches, there is a need to overwrite `ProcessPayPalOrderAction`, `CompletePayPalOrderFromPaymentPageAction`, and `CaptureAction` with modified logic.

The advisory is available at github.com. This vulnerability was named CVE-2025-29788 since 03/11/2025. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. The technical details are unknown and an exploit is not available.

Upgrading to version 1.6.1, 1.7.1 or 2.0.1 eliminates this vulnerability.

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Productinfo

Vendor

• Sylius

Name

• PayPalPlugin

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.6.0
• 1.7.0
• 2.0

Website

• Product: https://github.com/Sylius/PayPalPlugin/

CPE 2.3info

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CPE 2.2info

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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