CVE-2025-7820 is a vulnerability classified under CWE-602 (Client-Side Enforcement of Server-Side Security) found in the SKT PayPal for WooCommerce plugin for WordPress, affecting all versions up to 1.4. The core issue is that the plugin relies solely on client-side controls to validate payment processing, failing to implement robust server-side checks. This architectural flaw allows unauthenticated attackers to manipulate client-side data or requests to bypass payment confirmation, effectively enabling them to complete purchases without actual payment. The vulnerability is remotely exploitable without any authentication or user interaction, increasing its risk profile. The CVSS v3.1 score of 7.5 reflects a high severity due to the ease of exploitation (network vector, low attack complexity, no privileges or user interaction required) and the significant impact on integrity (confirmed purchases without payment). Although no public exploits are known yet, the vulnerability poses a substantial threat to the financial integrity of affected e-commerce platforms. The lack of server-side validation undermines the trustworthiness of transaction processing, potentially leading to revenue loss and fraudulent orders. The vulnerability was reserved in July 2025 and published in November 2025, with no patches currently available, emphasizing the urgency for developers and site administrators to address this issue promptly.

For European organizations, especially those operating e-commerce platforms using WordPress with the SKT PayPal for WooCommerce plugin, this vulnerability can lead to significant financial losses due to fraudulent transactions. Attackers can exploit the flaw to obtain goods or services without payment, damaging revenue streams and potentially harming customer trust. The integrity of transaction data is compromised, which may also affect accounting and compliance processes. Additionally, the presence of such a vulnerability could expose organizations to reputational damage and legal liabilities under European data protection and consumer protection regulations. Since the vulnerability requires no authentication or user interaction, it can be exploited at scale, increasing the risk of widespread fraud. Organizations relying on this plugin for payment processing must consider the risk of operational disruption and financial impact until the vulnerability is remediated.

1. Immediately audit all WordPress sites using the SKT PayPal for WooCommerce plugin to identify affected versions (up to 1.4). 2. Disable or remove the vulnerable plugin until an official patch or update is released by the vendor. 3. Implement server-side validation for all payment processing workflows to ensure that payment confirmations are verified independently of client-side controls. 4. Monitor transaction logs for suspicious activity, such as unusually high numbers of confirmed purchases without corresponding payment records. 5. Employ Web Application Firewalls (WAFs) with custom rules to detect and block anomalous payment requests that bypass normal payment flows. 6. Educate development teams on secure coding practices emphasizing the importance of server-side enforcement of critical business logic. 7. Prepare incident response plans to address potential fraud cases stemming from exploitation of this vulnerability. 8. Once patches are available, prioritize timely updates and verify the effectiveness of fixes through penetration testing and code review.