CVE-2026-31215: Critical severity nexent Nexent backend service vulnerability

The nexent v1.7.5.2 backend service contains an unauthorized arbitrary file deletion vulnerability in its ElasticSearch service interface. The DELETE /{indexname}/documents endpoint lacks proper authentication and authorization controls and does not validate the user-supplied pathorurl parameter. This allows unauthenticated remote attackers to send crafted requests that trigger the deletion of arbitrary documents from ElasticSearch indices and corresponding files from the MinIO storage system. Successful exploitation leads to data destruction and denial of service.