CVE-2026-77540 PUBLISHED

Assigner: Ubiquiti
Reserved: 20.08.2026 Published: 26.08.2026 Updated: 26.08.2026

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.

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
CVSS Score: 9.1

Attack Vector	Network	Scope	Changed
Attack Complexity	Low	Confidentiality Impact	High
Privileges Required	High	Integrity Impact	High
User Interaction	None	Availability Impact	High

CVSS 3.1

Product Status

Vendor	Ubiquiti Inc
Product	UniFi OS Server
Versions	Default: unaffected affected from 0 to 5.1.37 (excl.)

References

https://community.ui.com/releases/Security-Advisory-Bulletin-067/fc4a3488-7c43-4628-8bab-f715e96dbfc9

Problem Types

CWE-20 Improper input validation CWE