CVE-2025-40667 is a high-severity missing authorization vulnerability (CWE-862) affecting TCMAN's GIM product, version 11. The vulnerability allows an authenticated attacker to bypass authorization controls and access any functionality within the application, including those not normally accessible through the user interface. Exploitation requires the attacker to manipulate the HTTP response code from '302 Found' to '200 OK' and modify hidden form fields named 'hdnReadOnly' and 'hdnUserLogin'. This indicates a flaw in the server-side authorization checks, where the application relies on client-side controls or insufficient validation to restrict access. The vulnerability does not require user interaction beyond authentication and can be exploited remotely over the network (AV:N). The CVSS 4.0 base score is 8.7, reflecting high impact on confidentiality, integrity, and availability, with low attack complexity and no need for user interaction. Although no known exploits are currently reported in the wild, the vulnerability poses a significant risk due to the broad access it grants once exploited. The lack of patch links suggests that a fix may not yet be publicly available, increasing the urgency for mitigation. This vulnerability could allow attackers to perform unauthorized actions, potentially leading to data leakage, unauthorized configuration changes, or disruption of service within the affected TCMAN GIM environment.

For European organizations using TCMAN GIM v11, this vulnerability presents a critical risk to the confidentiality, integrity, and availability of their systems and data. Since the vulnerability allows authenticated users to escalate privileges and access restricted functionalities, insider threats or compromised credentials could lead to extensive unauthorized access. This could result in exposure of sensitive information, unauthorized operational changes, or sabotage of critical processes managed through the GIM application. Given that TCMAN GIM is likely used in enterprise or industrial management contexts, the impact could extend to operational disruptions or compliance violations under European data protection regulations such as GDPR. The high severity and ease of exploitation mean that organizations must prioritize detection and mitigation to prevent potential breaches or operational impacts.

1. Immediate mitigation should include restricting access to TCMAN GIM v11 to trusted users only and enforcing strong authentication mechanisms to reduce the risk of credential compromise. 2. Monitor and log all access and administrative actions within the application to detect anomalous behavior indicative of exploitation attempts. 3. Implement network-level controls such as IP whitelisting or VPN access to limit exposure of the application to untrusted networks. 4. Since no official patches are currently available, consider deploying web application firewalls (WAFs) with custom rules to detect and block HTTP response code manipulation and suspicious modifications of hidden form fields. 5. Conduct thorough code and configuration reviews to identify and remediate other potential authorization weaknesses. 6. Engage with the vendor for timely patch releases and apply updates as soon as they become available. 7. Educate users about the risks of credential sharing and phishing to reduce the likelihood of attacker authentication.