CVE-2025-36636 is a medium-severity improper access control vulnerability identified in Tenable Security Center, a widely used vulnerability management and security analytics platform. The flaw exists in versions prior to 6.7.0 and allows authenticated users to bypass authorization restrictions, granting them access to areas or functions outside their assigned permissions. This vulnerability stems from insufficient enforcement of access control policies (CWE-284), enabling privilege escalation within the application context. Although the vulnerability does not directly compromise confidentiality or availability, it can lead to unauthorized integrity modifications, such as altering scan results or security configurations, which could mislead security teams or weaken defenses. The vulnerability requires an attacker to be authenticated, which limits exposure to internal or trusted users, but no additional user interaction is necessary, and the attack can be conducted remotely over the network. The CVSS v3.1 base score of 4.3 reflects these factors: network attack vector, low attack complexity, required privileges, no user interaction, unchanged scope, no confidentiality or availability impact, and limited integrity impact. No public exploits or active exploitation have been reported, but the vulnerability's presence in a critical security management tool makes it a significant concern. The lack of a patch link suggests that remediation involves upgrading to version 6.7.0 or later, which presumably addresses the access control weakness. Organizations relying on Tenable Security Center for vulnerability management should assess user roles and permissions, ensuring strict adherence to the principle of least privilege to minimize potential abuse.

For European organizations, this vulnerability poses a risk primarily to the integrity of security management processes. Unauthorized access to restricted areas within Tenable Security Center could allow malicious insiders or compromised accounts to alter vulnerability data, suppress alerts, or manipulate security configurations, potentially leading to undetected security incidents or misinformed risk assessments. This undermines trust in security operations and can delay incident response. While confidentiality and availability impacts are minimal, the integrity compromise can have cascading effects on compliance with regulations such as GDPR, which mandates accurate security controls and incident reporting. Organizations with large, distributed security teams or complex role-based access controls are at higher risk if user permissions are not tightly managed. The absence of known exploits reduces immediate threat but does not eliminate the risk of future exploitation, especially given the critical role of Tenable Security Center in enterprise security.

To mitigate this vulnerability, European organizations should promptly upgrade Tenable Security Center to version 6.7.0 or later, where the access control issue is resolved. Until the upgrade is applied, organizations should conduct a thorough audit of user roles and permissions within the platform, ensuring that users have only the minimum necessary privileges. Implement strict role-based access controls and monitor for anomalous access patterns or privilege escalations. Employ multi-factor authentication (MFA) for all users to reduce the risk of compromised credentials being used to exploit this vulnerability. Additionally, segregate duties among security personnel to prevent a single user from having excessive control. Regularly review and update access policies and maintain detailed logs of user activities within the Security Center for forensic analysis. Finally, stay informed about vendor advisories for any patches or workarounds and test upgrades in controlled environments before deployment.