Critical severity9.1NVD Advisory· Published Aug 26, 2026· Updated Aug 27, 2026
CVE-2026-77539
CVE-2026-77539
Description
A malicious actor with access to the network and high privileges could exploit an Improper Input Validation vulnerability found in UniFi OS Server to execute a Command Injection on the host device.
Affected products
1Patches
Vulnerability mechanics
References
1News mentions
1- 21 Critical Ubiquiti UniFi Flaws Enable Authentication Bypass, Command Injection and Privilege EscalationCyber Security News · Aug 26, 2026