CVE-2025-66154 identifies a Missing Authorization vulnerability (CWE-862) in the merkulove Couponer for Elementor WordPress plugin, specifically in versions up to 1.1.7. This vulnerability stems from improperly configured access control mechanisms within the plugin, which fail to adequately verify whether a user has the necessary permissions to perform certain actions. As a result, users with limited privileges (such as authenticated but non-administrative users) can exploit this flaw to execute unauthorized operations that affect the integrity and availability of the coupon management features. The CVSS 3.1 base score is 5.4, indicating a medium severity level. The vector string (AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L) shows that the attack can be performed remotely over the network with low attack complexity, requires some privileges but no user interaction, and impacts integrity and availability but not confidentiality. The vulnerability does not currently have known exploits in the wild, and no official patches have been released yet. This vulnerability is particularly concerning for organizations relying on this plugin for e-commerce promotions, as unauthorized changes to coupons could disrupt sales or cause financial losses. The issue highlights the importance of strict access control enforcement in WordPress plugins, especially those handling transactional or promotional data.

For European organizations, the impact of CVE-2025-66154 can be significant in e-commerce environments where the Couponer for Elementor plugin is used. Unauthorized users could manipulate coupon data, potentially invalidating discounts, creating fraudulent coupons, or disabling coupon functionality, leading to revenue loss and customer dissatisfaction. The integrity of promotional campaigns could be compromised, damaging brand reputation. Availability impacts could disrupt normal business operations by causing coupon-related features to malfunction. Although confidentiality is not directly affected, the indirect effects on business processes and customer trust are notable. Organizations with high e-commerce dependency and extensive use of WordPress plugins are at greater risk. Additionally, regulatory compliance considerations under GDPR may arise if the disruption affects customer transactions or data indirectly. The absence of known exploits reduces immediate risk but does not eliminate the threat, especially as attackers may develop exploits once the vulnerability is publicly known.

To mitigate CVE-2025-66154, European organizations should first conduct an immediate audit of user permissions related to the Couponer for Elementor plugin, ensuring that only trusted and necessary users have access to coupon management features. Implement strict role-based access controls (RBAC) and limit plugin administrative capabilities to essential personnel. Monitor logs for unusual activities related to coupon creation or modification. Since no official patch is currently available, consider temporarily disabling the plugin or replacing it with a more secure alternative until a fix is released. Employ Web Application Firewalls (WAF) with custom rules to detect and block suspicious requests targeting coupon management endpoints. Regularly update WordPress core and all plugins to minimize exposure to other vulnerabilities. Engage with the vendor or security community to track patch releases and apply them promptly. Finally, conduct security awareness training for administrators to recognize and respond to potential exploitation attempts.