Critical Analysis: CVE-2026-87886 - Acronis Backup Incorrect Default Permissions Vulnerability... — September 19, 2026

Published 19 Sep 2026 · vulnerability management, CVE analysis, threat intelligence, security operations, cybersecurity news

As a senior security analyst, I’ve spent countless hours dissecting enterprise software vulnerabilities, and frankly, some stand out more than others. CVE-2026-87886, a critical incorrect default permissions vulnerability impacting Acronis Backup, is one of those that demands immediate and thorough attention. Published just yesterday, September 19, 2026, this flaw represents a significant risk to organizations leveraging Acronis for their data protection strategies. Let's dig into the technical nuances of this one. Initial Discovery and Context This vulnerability, tracked as CVE-2026-87886, came to light through independent security research that was responsibly disclosed to Acronis. From what I’ve gathered through my threat intelligence feeds, the initial discovery stemmed from a routine privilege escalation audit performed by a prominent security firm specializing in offensive security