CVE-2025-53343 is a security vulnerability classified under CWE-862, which pertains to Missing Authorization in the GoodLayers Modernize product, specifically affecting versions up to 3.4.0. This vulnerability arises from incorrectly configured access control security levels, allowing an attacker with limited privileges (PR:L - Privileges Required: Low) to perform unauthorized actions that should be restricted. The vulnerability does not require user interaction (UI:N) and can be exploited remotely over the network (AV:N - Attack Vector: Network). The scope is unchanged (S:U), meaning the impact is confined to the vulnerable component without affecting other components or systems. The CVSS v3.1 base score is 4.3, indicating a medium severity level. The impact primarily affects the integrity of the system (I:L) without compromising confidentiality or availability. Since no patches or known exploits are currently available, the vulnerability represents a moderate risk but could be leveraged to escalate privileges or manipulate data within the application. The absence of confidentiality and availability impact suggests that sensitive data leakage or denial of service is not a direct consequence, but the integrity compromise could lead to unauthorized modifications or actions within the application context.

For European organizations using GoodLayers Modernize, this vulnerability could lead to unauthorized modifications within their web environments, potentially undermining trust in the affected applications. Given that the attack requires only low-level privileges and no user interaction, it could be exploited by internal threat actors or external attackers who have gained minimal access. This could result in data tampering, unauthorized configuration changes, or other integrity violations that disrupt business processes or compliance with data protection regulations such as GDPR. While the vulnerability does not directly expose confidential data or cause service outages, the integrity compromise could indirectly affect operational reliability and regulatory compliance, especially in sectors like finance, healthcare, and government where data integrity is critical.

European organizations should implement strict access control reviews and ensure that authorization checks are properly enforced within the GoodLayers Modernize application. Since no official patches are currently available, organizations should consider the following specific measures: 1) Conduct a thorough audit of user roles and permissions to minimize the risk of privilege misuse. 2) Employ web application firewalls (WAFs) to detect and block suspicious requests that attempt to exploit access control weaknesses. 3) Monitor application logs for unusual activity indicative of unauthorized access attempts. 4) If feasible, restrict network access to the Modernize application to trusted IP ranges to reduce exposure. 5) Engage with GoodLayers or relevant vendors for timely updates or patches and apply them promptly once released. 6) Consider implementing additional application-layer authorization controls or compensating controls such as multi-factor authentication for sensitive operations within the application.