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 Payment Plugins for PayPal WooCommerce WordPress plugin before 2.0.20 does not have proper authorization checks on a REST endpoint, allowing unauthenticated users to bypass payments

A vulnerability was detected in AojiaoZero Antaris 1.0. This affects the function rewardPurchase of the file /ipn.php of the component PayPal IPN Payment Handler. The manipulation of the argument itemnumber results in sql injection. The attack may be performed from remote. The vendor was contacted early about this disclosure but did not respond in any way.

The Subscriptions & Memberships for PayPal plugin for WordPress is vulnerable to fake payment creation in all versions up to, and including, 1.1.7. This is due to the plugin not properly verifying the authenticity of an IPN request. This makes it possible for unauthenticated attackers to create fake payment entries that have not actually occurred.

The Paypal Donation Shortcode plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'paypal' shortcode in all versions up to, and including, 0.1. This is due to the plugin not properly sanitizing user input and output of the 'title' and 'text' parameters. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

The PayPal Forms plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 1.0.3. This is due to missing nonce validation on the form creation and management functions. This makes it possible for unauthenticated attackers to create new PayPal forms and modify PayPal payment settings via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.

The Subscriptions & Memberships for PayPal plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 1.1.6. This is due to missing or incorrect nonce validation on a function. This makes it possible for unauthenticated attackers to delete arbitrary posts via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.

The Checkout for PayPal plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's 'checkoutforpaypal' shortcode in all versions up to, and including, 1.0.32 due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

The Payment Button for PayPal plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's 'wppaypalcheckout' shortcode in all versions up to, and including, 1.2.3.35 due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

The Donation Block For PayPal WordPress plugin through 2.1.0 does not sanitise and escape form submissions, leading to a stored cross-site scripting vulnerability

In the module "PayPal Official" for PrestaShop 7+ releases prior to version 6.4.2 and for PrestaShop 1.6 releases prior to version 3.18.1, a malicious customer can confirm an order even if payment is finally declined by PayPal. A logical weakness during the capture of a payment in case of disabled webhooks can be exploited to create an accepted order. This could allow a threat actor to confirm an order with a fraudulent payment support. Versions 6.4.2 and 3.18.1 contain a patch for the issue. Additionally, users enable webhooks and check they are callable.

sanitize-url (aka @braintree/sanitize-url) before 6.0.2 allows XSS via HTML entities.

Versions of the package nemo-appium before 0.0.9 are vulnerable to Command Injection due to improper input sanitization in the 'module.exports.setup' function. Note: In order to exploit this vulnerability appium-running 0.1.3 has to be installed as one of nemo-appium dependencies.

A flaw was found in sanitize-url due to improper sanitization in the sanitizeUrl function. This issue causes vulnerability to Cross-site Scripting in sanitize-url.

paypal/adaptivepayments-sdk-php v3.9.2 is vulnerable to a reflected XSS in the SetPaymentOptions.php resulting code execution

paypal/permissions-sdk-php is vulnerable to reflected XSS in the samples/GetAccessToken.php verificationcode parameter, resulting in code execution.

paypal/invoice-sdk-php is vulnerable to reflected XSS in samples/permissions.php via the permToken parameter, resulting in code execution.

WebHybridClient.java in PayPal 5.3 and earlier for Android ignores SSL errors, which allows man-in-the-middle attackers to spoof servers and obtain sensitive information.

The WebHybridClient class in PayPal 5.3 and earlier for Android allows remote attackers to execute arbitrary JavaScript on the system.

Cross-site scripting (XSS) vulnerability in GetAuthDetails.html.php in PayPal PHP Merchant SDK (aka merchant-sdk-php) 3.9.1 allows remote attackers to inject arbitrary web script or HTML via the token parameter.

PayPal WPS ToolKit does not verify that the server hostname matches a domain name in the subject's Common Name (CN) or subjectAltName field of the X.509 certificate, which allows man-in-the-middle attackers to spoof SSL servers via an arbitrary valid certificate.

The PayPal module in Ubercart does not verify that the server hostname matches a domain name in the subject's Common Name (CN) or subjectAltName field of the X.509 certificate, which allows man-in-the-middle attackers to spoof SSL servers via an arbitrary valid certificate.

The PayPal merchant SDK does not verify that the server hostname matches a domain name in the subject's Common Name (CN) or subjectAltName field of the X.509 certificate, which allows man-in-the-middle attackers to spoof SSL servers via an arbitrary valid certificate.

The PayPal Pro PayFlow EC module in osCommerce does not verify that the server hostname matches a domain name in the subject's Common Name (CN) or subjectAltName field of the X.509 certificate, which allows man-in-the-middle attackers to spoof SSL servers via an arbitrary valid certificate.

The PayPal IPN utility does not verify that the server hostname matches a domain name in the subject's Common Name (CN) or subjectAltName field of the X.509 certificate, which allows man-in-the-middle attackers to spoof SSL servers via an arbitrary valid certificate, related to use of the PHP fsockopen function.