CVE-2025-31000 is a security vulnerability classified under CWE-862 (Missing Authorization) affecting the Payment QR WooCommerce plugin developed by Miguel Fuentes. This vulnerability arises due to improperly configured access control mechanisms within the plugin, allowing unauthorized users to perform actions or access resources that should be restricted. Specifically, the flaw enables exploitation of incorrect or missing authorization checks, which means that an attacker can potentially manipulate the plugin's functionality without proper permissions. The affected versions include all versions up to 1.1.6, although the exact range is not fully specified. The vulnerability has a CVSS 3.1 base score of 5.3, indicating a medium severity level. The vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N) reveals that the attack can be executed remotely over the network without any privileges or user interaction, with low attack complexity. The impact is limited to integrity loss, with no confidentiality or availability impact. No known exploits are currently reported in the wild, and no patches have yet been linked or published. The vulnerability affects the integrity of the plugin's operations, potentially allowing attackers to alter payment-related data or transactions processed through the Payment QR WooCommerce plugin, which is a component used in e-commerce environments to facilitate QR code-based payments integrated with WooCommerce, a popular WordPress e-commerce platform.

For European organizations, especially those operating e-commerce platforms using WooCommerce with the Payment QR plugin, this vulnerability poses a risk to transactional integrity. Attackers exploiting this flaw could manipulate payment processes, potentially altering transaction details or payment statuses without authorization. This could lead to financial discrepancies, fraudulent transactions, or loss of trust from customers. Although the vulnerability does not directly compromise confidentiality or availability, the integrity impact can have significant business consequences, including financial loss, reputational damage, and regulatory scrutiny under frameworks such as GDPR if customer transaction data is affected. Given the widespread use of WooCommerce in Europe, particularly among small and medium-sized enterprises (SMEs) that may rely on third-party plugins for payment processing, the threat is relevant. However, the absence of known exploits and the medium severity score suggest that immediate widespread exploitation is unlikely but should not be discounted.

European organizations using the Payment QR WooCommerce plugin should take proactive steps to mitigate this vulnerability. First, they should monitor official channels for patches or updates from the plugin developer and apply them promptly once available. In the interim, administrators should review and tighten access control configurations within their WooCommerce environment, ensuring that only authorized roles have permissions to manage or interact with payment QR functionalities. Implementing Web Application Firewalls (WAFs) with rules to detect and block anomalous requests targeting the plugin endpoints can provide additional protection. Conducting thorough audits of user roles and permissions in WordPress and WooCommerce is critical to minimize the attack surface. Organizations should also consider isolating or disabling the Payment QR plugin if it is not essential to their operations until a fix is released. Finally, maintaining comprehensive logging and monitoring of payment-related activities can help detect suspicious behavior indicative of exploitation attempts.