Summary
Sylius PayPal Plugin allows unauthorized access to Credit card form, exposing payer name and not requiring 3DS
Workarounds
One can override a sylius_paypal_plugin_pay_with_paypal_form route and change its URL parameters to (for example) {orderToken}/{paymentId}, then override the Sylius\PayPalPlugin\Controller\PayWithPayPalFormAction service, to operate on the payment taken from the repository by these 2 values. It would also require usage of custom repository method.
Additionally, one could override the @SyliusPayPalPlugin/payWithPaypal.html.twig template, to add contingencies: ['SCA_ALWAYS'] line in hostedFields.submit(...) function call (line 421). It would then have to be handled in the function callback.
For more information
If you have any questions or comments about this advisory:
- Open an issue in Sylius/PayPalPlugin issues
- Email us at security at sylius dot com
Impact
URL to the payment page done after checkout was created with autoincremented payment id (/pay-with-paypal/{id}) and therefore it was easy to access for anyone, not even the order's customer. The problem was, the Credit card form has prefilled "credit card holder" field with the Customer's first and last name.
Additionally, the mentioned form did not require a 3D Secure authentication, as well as did not checked the result of the 3D Secure authentication.
CVE-2021-41120 has a CVSS score of 7.5 (High). The vector is network-reachable, no privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (1.2.4, 1.3.1); upgrading removes the vulnerable code path.
Affected versions
Security releases
Kodem intelligence
Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.
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The problem has been patched in Sylius/PayPalPlugin 1.2.4 and 1.3.1
Frequently Asked Questions
- What is CVE-2021-41120? CVE-2021-41120 is a high-severity security vulnerability in sylius/paypal-plugin (composer), affecting versions >= 1.0.0, < 1.2.4. It is fixed in 1.2.4, 1.3.1.
- How severe is CVE-2021-41120? CVE-2021-41120 has a CVSS score of 7.5 (High). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
- Which versions of sylius/paypal-plugin are affected by CVE-2021-41120? sylius/paypal-plugin (composer) versions >= 1.0.0, < 1.2.4 is affected.
- Is there a fix for CVE-2021-41120? Yes. CVE-2021-41120 is fixed in 1.2.4, 1.3.1. Upgrade to this version or later.
- Is CVE-2021-41120 exploitable, and should I be worried? Whether CVE-2021-41120 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
- What actually determines whether CVE-2021-41120 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
- How do I fix CVE-2021-41120?
- Upgrade
sylius/paypal-pluginto 1.2.4 or later - Upgrade
sylius/paypal-pluginto 1.3.1 or later
- Upgrade