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TI-2026-54059 Aliases CVE-2026-77539GHSA-2j95-j9fx-32w6

Improper input validation in Ubiquiti UniFi OS Server

Priority MEDIUM 44CWE-20Published · Updated

Key facts

Attack vector
Network
Privileges required
High
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.01294 70th percentileScored 2026-11-07
Fix Fixed UniFi OS Server (Ubiquiti Inc): 5.1.37

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
UbiquitiUniFi OS Serverbefore 5.1.375.1.37Patch availableCNA
  • UniFi OS Server VendorUbiquiti Affected before 5.1.37 Fixed in 5.1.37 Patch available CNA

Remediation

  • Fix · CNA UniFi OS Server (Ubiquiti Inc) Fixed in 5.1.37

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    Ubiquiti UniFi OS Server 5.1.37

    7 records Highest priority Priority MEDIUM 7 MEDIUM

    Other records, highest priority first

    • TI-2026-54070 A malicious actor with access to the network could exploit an Improper Neutralization of…Priority MEDIUM 50
    • TI-2026-54060 Improper input validation in Ubiquiti UniFi OS ServerPriority MEDIUM 44
    • TI-2026-54056 Improper access control in Ubiquiti UniFi OS ServerPriority MEDIUM 43
    Show all 7 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-77539
  2. 2026-10-03 Alias added: GHSA-2j95-j9fx-32w6

References

Other 1

  • TI-2026-27142 Improper input validation in Ubiquiti UniFi OS Server KEVCVSS 3.1CRITICAL 10.0
  • TI-2026-27141 Path traversal in Ubiquiti UniFi OS Server KEVCVSS 3.1CRITICAL 10.0
  • TI-2026-27140 Improper access control in Ubiquiti UniFi OS Server KEVCVSS 3.1CRITICAL 10.0
  • TI-2010-05027 On certain Ubiquiti devices, Command Injection exists via a GET request to stainfo.cgi… KEVCVSS 3.1CRITICAL 9.8
  • TI-2020-19187 AirControl 1.4.2 - PreAuth Remote Code Execution CVSS 4.0CRITICAL 9.3
  • TI-2015-07644 Ubiquiti airOS HTTP(S) unauthenticated arbitrary file upload CVSS 3.0CRITICAL 9.8
See all 206 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences