An incorrect authorization vulnerability in Sonatype Nexus Repository 3 allows an authenticated user with high privileges to perform unauthorized actions on the platform.

The vulnerability is defined by CWE-863, where the application fails to correctly enforce authorization checks for specific functions. This allows a user who has already authenticated with high privileges to bypass intended security constraints and perform actions they are not explicitly authorized to execute.

The potential for unauthorized administrative actions poses a high risk to the integrity of the software supply chain managed by the repository. With a CVSS score of 8.2, this vulnerability could allow an attacker to modify repository configurations, alter artifacts, or gain unauthorized control over the repository environment, which could lead to severe long-term security consequences.

Immediate Action: Update Sonatype Nexus Repository 3 to version 3.95.0 or later to resolve the authorization logic flaw.

Proactive Monitoring: Audit administrative logs for unusual configuration changes or unauthorized repository access attempts originating from privileged user accounts.

Compensating Controls: Implement strict access control lists and review role-based access control (RBAC) configurations to ensure that high-privilege users only have the minimum permissions necessary for their duties.

Public Exploit Available: No

Given the critical role of the Nexus Repository in software development, this vulnerability must be addressed by updating to the fixed version immediately. Organizations should also conduct a post-update audit of their repository permissions to ensure no unauthorized changes were made prior to the patch.