Command Injection Vulnerability in UniFi OS Server by Ubiquiti
CVE-2026-77540

9.1CRITICAL

Key Information:

Vendor

Ubiquiti Inc

Status
Unifi Os Server
Vendor
CVE Published:
26 August 2026

What is CVE-2026-77540?

A vulnerability exists in UniFi OS Server due to improper input validation, allowing an attacker with network access and high privileges to execute malicious commands on the host device. This situation poses a significant threat to network integrity and security. Ensure to implement protective measures and monitor your systems to mitigate exposure.

Affected Version(s)

UniFi OS Server 0 < 5.1.37

References

https://community.ui.com/releases/Security-Advisory-Bulle...

CVSS V3.1

Score:
9.1
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
High
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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