CVE-2026-24583 identifies a missing authorization vulnerability in the SumUp Payment Gateway plugin for WooCommerce, specifically affecting versions up to 2.7.9. This plugin integrates SumUp's payment processing capabilities into WooCommerce-based e-commerce websites. The vulnerability arises from incorrectly configured access control mechanisms, which fail to properly verify whether a requester is authorized to perform certain actions or access specific resources within the plugin. Because the vulnerability can be exploited remotely without requiring authentication or user interaction, an attacker can potentially access sensitive information or perform unauthorized operations by sending crafted requests to the affected WooCommerce site. The CVSS 3.1 base score of 5.3 reflects a medium severity level, primarily due to the confidentiality impact (partial data exposure) without affecting integrity or availability. The attack vector is network-based, with low attack complexity and no privileges or user interaction needed. Although no known exploits have been reported in the wild, the vulnerability poses a tangible risk to e-commerce merchants using this plugin, especially if they handle sensitive customer payment data. The lack of a patch link suggests that a fix may not yet be publicly available, emphasizing the need for vigilance and interim protective measures.

For European organizations, the vulnerability could lead to unauthorized disclosure of sensitive payment or customer information processed through the SumUp Payment Gateway on WooCommerce platforms. This exposure could undermine customer trust, violate data protection regulations such as the GDPR, and potentially result in financial losses or reputational damage. Since the vulnerability does not affect data integrity or system availability, the risk is confined to confidentiality breaches. However, given the critical nature of payment data, even limited data leaks can have significant consequences. E-commerce businesses in Europe that rely on WooCommerce and the SumUp plugin are particularly at risk, especially those with high transaction volumes or those operating in regulated sectors. The absence of known exploits reduces immediate threat levels but does not eliminate the risk of future exploitation. Organizations failing to address this vulnerability may face compliance issues and increased exposure to cybercriminal activity targeting payment systems.

Organizations should monitor official SumUp and WooCommerce channels for the release of a security patch addressing CVE-2026-24583 and apply it promptly once available. Until a patch is released, administrators should implement strict access control rules at the web server or application firewall level to restrict access to the payment gateway endpoints only to trusted IP addresses or authenticated users. Conduct thorough audits of plugin configurations to ensure no unnecessary permissions or public access points exist. Employ network segmentation to isolate e-commerce systems and limit exposure. Additionally, enable detailed logging and monitoring to detect any suspicious or unauthorized access attempts targeting the payment gateway. Regularly review and update WooCommerce and related plugins to minimize the attack surface. Educate staff on the importance of timely updates and secure configuration management. Finally, consider alternative payment gateway solutions if immediate patching is not feasible and the risk is deemed unacceptable.