Payment Button for PayPal Plugin up to 1.2.3.44 on WordPress client-side enforcement of server-side security

Summaryinfo

A vulnerability categorized as problematic has been discovered in Payment Button for PayPal Plugin up to 1.2.3.44. This affects an unknown part. Executing a manipulation can lead to client-side enforcement of server-side security. The identification of this vulnerability is CVE-2026-16990. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability has been found in Payment Button for PayPal Plugin up to 1.2.3.44 and classified as problematic. This vulnerability affects an unknown functionality. The manipulation with an unknown input leads to a client-side enforcement of server-side security vulnerability. The CWE definition for the vulnerability is CWE-602. The product is composed of a server that relies on the client to implement a mechanism that is intended to protect the server. As an impact it is known to affect integrity. CVE summarizes:

The Payment Button for PayPal WordPress plugin through 1.2.3.44 does not enforce the merchant-configured price server-side and trusts a client-supplied payment amount, allowing unauthenticated attackers to create a real PayPal order against the merchant for an arbitrary lower amount.

The advisory is shared for download at wpscan.com. This vulnerability was named CVE-2026-16990 since 07/24/2026. 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. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 08/12/2026).

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

Name

• Payment Button for PayPal Plugin

Version

• 1.2.3.0
• 1.2.3.1
• 1.2.3.2
• 1.2.3.3
• 1.2.3.4
• 1.2.3.5
• 1.2.3.6
• 1.2.3.7
• 1.2.3.8
• 1.2.3.9
• 1.2.3.10
• 1.2.3.11
• 1.2.3.12
• 1.2.3.13
• 1.2.3.14
• 1.2.3.15
• 1.2.3.16
• 1.2.3.17
• 1.2.3.18
• 1.2.3.19
• 1.2.3.20
• 1.2.3.21
• 1.2.3.22
• 1.2.3.23
• 1.2.3.24
• 1.2.3.25
• 1.2.3.26
• 1.2.3.27
• 1.2.3.28
• 1.2.3.29
• 1.2.3.30
• 1.2.3.31
• 1.2.3.32
• 1.2.3.33
• 1.2.3.34
• 1.2.3.35
• 1.2.3.36
• 1.2.3.37
• 1.2.3.38
• 1.2.3.39
• 1.2.3.40
• 1.2.3.41
• 1.2.3.42
• 1.2.3.43
• 1.2.3.44

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