CVE-2025-39454 is a security vulnerability classified under CWE-862, which indicates a Missing Authorization issue in the software product "Name Directory" developed by Jeroen Peters. This vulnerability affects versions up to 1.30.0, though the exact affected versions are not fully specified (noted as "n/a" in the data). The core technical issue is that the application fails to properly enforce authorization checks, allowing users with limited privileges (PR:L - Privileges Required: Low) to perform actions or access resources beyond their authorized scope without requiring user interaction (UI:N). The vulnerability is remotely exploitable over the network (AV:N) with low attack complexity (AC:L), meaning an attacker with low-level privileges can exploit this flaw without needing complex conditions or user involvement. The impact is limited to integrity (I:L) with no confidentiality (C:N) or availability (A:N) impact, indicating that attackers can modify data or state in the system but cannot read sensitive information or cause denial of service. The vulnerability scope is unchanged (S:U), meaning the exploit does not affect resources beyond the vulnerable component. The CVSS v3.1 base score is 4.3, categorizing this as a medium severity issue. No known exploits are reported in the wild yet, and no patches have been linked or published at this time. This vulnerability could allow an attacker with limited access to escalate their privileges or manipulate data within the Name Directory application, potentially undermining data integrity and trustworthiness of the directory information managed by the software.

For European organizations using the Name Directory software, this vulnerability poses a moderate risk primarily to data integrity within the affected system. Since the flaw allows unauthorized modification of data without affecting confidentiality or availability, attackers could alter directory entries, user information, or related metadata, potentially leading to misinformation, misrouting of communications, or erroneous access control decisions based on corrupted directory data. Organizations relying on this directory for identity management, access control, or internal communications could experience operational disruptions or compliance issues if data integrity is compromised. The risk is heightened in sectors where directory data accuracy is critical, such as government agencies, financial institutions, healthcare providers, and large enterprises with complex identity infrastructures. However, the lack of known active exploits and the requirement for at least low-level privileges reduce the immediacy of the threat. Still, attackers who have gained initial footholds through other means could leverage this vulnerability to escalate their control or manipulate directory data to facilitate further attacks.

To mitigate this vulnerability, European organizations should: 1) Immediately audit and review access controls and privilege assignments within the Name Directory application to ensure that users have the minimum necessary privileges. 2) Monitor logs and audit trails for unusual modification activities or access patterns that could indicate exploitation attempts. 3) Implement network segmentation and strict access controls to limit exposure of the Name Directory service to only trusted and necessary users and systems. 4) Engage with the vendor or developer (Jeroen Peters) to obtain patches or updates as soon as they become available; in the absence of official patches, consider temporary compensating controls such as additional authorization checks at the application or network level. 5) Conduct penetration testing and vulnerability assessments focusing on authorization mechanisms within the Name Directory to identify and remediate similar issues proactively. 6) Educate administrators and users about the risks of privilege escalation and enforce strong authentication and session management practices to reduce the risk of initial low-privilege compromise.