CVE-2026-31919 identifies a Missing Authorization vulnerability in the Advanced Coupons for WooCommerce Coupons plugin by Josh Kohlbach, affecting versions up to 4.7.1. This vulnerability arises from incorrectly configured access control mechanisms within the plugin, which is designed to extend WooCommerce’s coupon functionality. Missing authorization means that certain actions related to coupon management—such as creating, modifying, or deleting coupons—can be performed by unauthorized users or attackers who should not have such privileges. The flaw compromises the integrity of the coupon system, potentially allowing attackers to manipulate discount codes, which could lead to financial losses, fraudulent transactions, or abuse of promotional campaigns. The vulnerability does not require user interaction but does require the attacker to reach the vulnerable plugin interface, which is typically accessible to authenticated users or possibly through other means if the access control is insufficiently enforced. No public exploits have been reported yet, and no CVSS score has been assigned. However, the vulnerability is critical for e-commerce environments relying on this plugin for coupon management. 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. The plugin is widely used in WooCommerce installations, which powers a significant portion of online stores globally, making this vulnerability relevant to many organizations.

The primary impact of this vulnerability is on the integrity and trustworthiness of the coupon system within WooCommerce stores using the Advanced Coupons plugin. Unauthorized actors could create or modify coupons to grant unintended discounts, resulting in direct financial losses and potential reputational damage. This could also disrupt marketing campaigns and customer loyalty programs. If attackers delete or alter coupons, it could cause operational disruptions and customer dissatisfaction. Additionally, the vulnerability could be leveraged as a foothold for further attacks within the e-commerce environment, potentially exposing other sensitive data or systems. The scope of affected systems is broad given WooCommerce’s extensive market penetration in e-commerce globally. The ease of exploitation depends on the attacker’s ability to access the vulnerable interface, but no user interaction is required once access is gained. The absence of authentication requirements or weak access controls would increase the risk substantially. Overall, the vulnerability poses a high risk to organizations relying on this plugin for coupon management.

Organizations should immediately audit their WooCommerce installations to identify if the Advanced Coupons for WooCommerce Coupons plugin version 4.7.1 or earlier is in use. Until an official patch is released, restrict access to coupon management interfaces to trusted administrators only and implement additional access control measures such as IP whitelisting or multi-factor authentication for admin accounts. Monitor coupon creation and modification logs for unusual activity or unexpected coupon codes. Consider temporarily disabling the plugin if coupon functionality is not critical or if the risk is deemed unacceptable. Stay informed about vendor updates and apply patches promptly once available. Additionally, conduct regular security reviews of all e-commerce plugins and maintain a robust incident response plan to quickly address any exploitation attempts. Employ web application firewalls (WAFs) with custom rules to detect and block suspicious requests targeting coupon management endpoints.