by Kastro
Paper/Archive/CVE-2026-77539

CVE-2026-77539

Ubiquiti Inc UniFi OS Server — A malicious actor with access to the network and high privileges could exploit an Improper Input Validation vulnerability found in UniFi…

EPSS 1%CVSS 9.1
critical.is priorityof 100
41
CVSS 9.1 (CNA)9.1 / 10 × 3027.3Not in CISA KEV+300.0EPSS percentile 70.3.703 × 2014.1No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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

ProductAffectedFixed inSource
UniFi OS Server< 5.1.375.1.37CNA

Scores by source

Ubiquiti (CNA)9.1CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

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