Nexus Incorrect Authorization Vulnerability - CVE-2026-77125

A vulnerability was identified in Sonatype Nexus Repository 3 in which two blobstore group management REST API endpoints did not correctly enforce the intended authorization check. A user granted only the nexus:blobstores:create permission could invoke these endpoints to convert an existing blobstore into a group blobstore an action that should require the nexus:blobstores:update permission instead. This could result in unauthorized modification of blobstore configuration without administrator