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CVE-2026-34908

CRITICAL KEV CISA Exploitation: ACTIVE
10.0
CVSS 3.1
Description
A malicious actor with access to the network could exploit an Improper Access Control vulnerability found in UniFi OS devices to make unauthorized changes to the system.

Metadata

CVE ID
CVE-2026-34908
State
PUBLISHED
Assigner
hackerone
Reserved
2026-03-31 15:00 UTC
Published
2026-05-22 00:43 UTC
Last updated
2026-06-24 03:55 UTC
Primary CWE
CWE-284
CWE-284 Improper Access Control - Generic
Vendor / Product
Ubiquiti Inc / UniFi OS Server
Sources
cve.org  ·  NVD

Severity & Metrics

10.0 CRITICAL CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
SSVC — CISA Coordinator
Exploitation
ACTIVE
Automatable
yes
Tech. Impact
total
CISA Known Exploited Vulnerability
Vulnerability name
Ubiquiti UniFi OS Improper Access Control Vulnerability
Vendor
Ubiquiti
Product
UniFi OS
Added to KEV
2026-06-23
Due date
2026-06-26
Ransomware
Not known
Required action
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
CISA description
Ubiquiti UniFi OS contains an improper access control vulnerability which could allow a malicious actor with access to the network to make unauthorized changes to the system.
Affected products (31)
VendorProductPlatformVersions
Ubiquiti Inc EFG — 0 < 5.1.12
Ubiquiti Inc ENVR — 0 < 5.1.12
Ubiquiti Inc ENVR-Core — 0 < 5.1.12
Ubiquiti Inc Express 7 — 0 < 5.1.12
Ubiquiti Inc UCG-Fiber — 0 < 5.1.12
Ubiquiti Inc UCG-Industrial — 0 < 5.1.12
Ubiquiti Inc UCG-Max — 0 < 5.1.12
Ubiquiti Inc UCG-Ultra — 0 < 5.1.12
Ubiquiti Inc UCK — 0 < 5.1.12
Ubiquiti Inc UCK-Enterprise — 0 < 5.1.12
Ubiquiti Inc UCKP — 0 < 5.1.12
Ubiquiti Inc UDM — 0 < 5.1.12
Ubiquiti Inc UDM-Beast — 0 < 5.1.11
Ubiquiti Inc UDM-Pro — 0 < 5.1.12
Ubiquiti Inc UDM-Pro-Max — 0 < 5.1.12
Ubiquiti Inc UDM-SE — 0 < 5.1.12
Ubiquiti Inc UDR — 0 < 5.1.12
Ubiquiti Inc UDR-5G — 0 < 5.1.12
Ubiquiti Inc UDR7 — 0 < 5.1.12
Ubiquiti Inc UDW — 0 < 5.1.12
Ubiquiti Inc UNAS-2 — 0 < 5.1.10
Ubiquiti Inc UNAS-4 — 0 < 5.1.10
Ubiquiti Inc UNAS-Pro — 0 < 5.1.10
Ubiquiti Inc UNAS-Pro-4 — 0 < 5.1.10
Ubiquiti Inc UNAS-Pro-8 — 0 < 5.1.10
Ubiquiti Inc UniFi OS Server — 0 < 5.0.8
Ubiquiti Inc UNVR — 0 < 5.1.12
Ubiquiti Inc UNVR-G2 — 0 < 5.1.12
Ubiquiti Inc UNVR-G2-Pro — 0 < 5.1.12
Ubiquiti Inc UNVR-Instant — 0 < 5.1.12
Ubiquiti Inc UNVR-Pro — 0 < 5.1.12
Weakness (CWE)
CWESourceDescription
CWE-284 cna CWE-284 Improper Access Control - Generic
CVSS scores (1)
ScoreSeverityVersionSourceVector
10.0 CRITICAL 3.1 cna CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
References (1)
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