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CVE-2026-34908

Quick assessment

Affected
Ubiquiti Inc UniFi OS Server
Exploitation
Confirmed exploitation in the wild; remediate immediately
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Ubiquiti UniFi OS Server是美国优比快（Ubiquiti）公司的一个统一管理UniFi网络与安防设备的服务器平台。 Ubiquiti UniFi OS Server存在安全漏洞，该漏洞源于访问控制不当，可能导致具有网络访问权限的恶意行为者对系统进行未经授权的更改。

CVSS 10.0 · Critical KEV EPSS 15.21% · P97

Public Exploits 1

Nuclei · 1 CVE-2026-34908.yaml [template]

Possible ATT&CK Techniques 1 AI

T1136.001 · Local Account

Affected Version Matrix 31

VendorProduct Version RangeStatus
Ubiquiti Inc EFG < 5.1.12 affected
Ubiquiti Inc ENVR < 5.1.12 affected
Ubiquiti Inc ENVR-Core < 5.1.12 affected
Ubiquiti Inc Express 7 < 5.1.12 affected
Ubiquiti Inc UCG-Fiber < 5.1.12 affected
Ubiquiti Inc UCG-Industrial < 5.1.12 affected
Ubiquiti Inc UCG-Max < 5.1.12 affected
Ubiquiti Inc UCG-Ultra < 5.1.12 affected
Ubiquiti Inc UCK < 5.1.12 affected
Ubiquiti Inc UCK-Enterprise < 5.1.12 affected
Ubiquiti Inc UCKP < 5.1.12 affected
Ubiquiti Inc UDM < 5.1.12 affected
Ubiquiti Inc UDM-Beast < 5.1.11 affected
Ubiquiti Inc UDM-Pro < 5.1.12 affected
Ubiquiti Inc UDM-Pro-Max < 5.1.12 affected
Ubiquiti Inc UDM-SE < 5.1.12 affected
Ubiquiti Inc UDR < 5.1.12 affected
Ubiquiti Inc UDR-5G < 5.1.12 affected
Ubiquiti Inc UDR7 < 5.1.12 affected
Ubiquiti Inc UDW < 5.1.12 affected
Ubiquiti Inc UNAS-2 < 5.1.10 affected
Ubiquiti Inc UNAS-4 < 5.1.10 affected
Ubiquiti Inc UNAS-Pro < 5.1.10 affected
Ubiquiti Inc UNAS-Pro-4 < 5.1.10 affected
Ubiquiti Inc UNAS-Pro-8 < 5.1.10 affected
Ubiquiti Inc UniFi OS Server < 5.0.8 affected
Ubiquiti Inc UNVR < 5.1.12 affected
Ubiquiti Inc UNVR-G2 < 5.1.12 affected
Ubiquiti Inc UNVR-G2-Pro < 5.1.12 affected
Ubiquiti Inc UNVR-Instant < 5.1.12 affected
Ubiquiti Inc UNVR-Pro < 5.1.12 affected
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I. Basic Information for CVE-2026-34908

Vulnerability Information
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Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
访问控制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Ubiquiti UniFi OS Server 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Ubiquiti UniFi OS Server是美国优比快（Ubiquiti）公司的一个统一管理UniFi网络与安防设备的服务器平台。 Ubiquiti UniFi OS Server存在安全漏洞，该漏洞源于访问控制不当，可能导致具有网络访问权限的恶意行为者对系统进行未经授权的更改。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Ubiquiti Inc UniFi OS Server 0 ~ 5.0.8 -
Ubiquiti Inc UDM 0 ~ 5.1.12 -
Ubiquiti Inc UDM-Pro 0 ~ 5.1.12 -
Ubiquiti Inc UDM-SE 0 ~ 5.1.12 -
Ubiquiti Inc UDM-Pro-Max 0 ~ 5.1.12 -
Ubiquiti Inc UDM-Beast 0 ~ 5.1.11 -
Ubiquiti Inc EFG 0 ~ 5.1.12 -
Ubiquiti Inc UDW 0 ~ 5.1.12 -
Ubiquiti Inc UDR 0 ~ 5.1.12 -
Ubiquiti Inc UDR7 0 ~ 5.1.12 -
Ubiquiti Inc UDR-5G 0 ~ 5.1.12 -
Ubiquiti Inc Express 7 0 ~ 5.1.12 -
Ubiquiti Inc UNVR 0 ~ 5.1.12 -
Ubiquiti Inc UNVR-Pro 0 ~ 5.1.12 -
Ubiquiti Inc UNVR-Instant 0 ~ 5.1.12 -
Ubiquiti Inc UNVR-G2 0 ~ 5.1.12 -
Ubiquiti Inc UNVR-G2-Pro 0 ~ 5.1.12 -
Ubiquiti Inc ENVR 0 ~ 5.1.12 -
Ubiquiti Inc ENVR-Core 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 UCKP 0 ~ 5.1.12 -
Ubiquiti Inc UCK 0 ~ 5.1.12 -
Ubiquiti Inc UCK-Enterprise 0 ~ 5.1.12 -
Ubiquiti Inc UCG-Ultra 0 ~ 5.1.12 -
Ubiquiti Inc UCG-Max 0 ~ 5.1.12 -
Ubiquiti Inc UCG-Fiber 0 ~ 5.1.12 -

II. Public POCs for CVE-2026-34908

# POC Description Source Link Shenlong Link
1 UniFi OS devices contain an improper access control vulnerability caused by insufficient authorization checks, letting network attackers make unauthorized system changes, exploit requires network access. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-34908.yaml POC Details
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III. Intelligence Information for CVE-2026-34908

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Vendor Advisories for CVE-2026-34908 (1)

Same Patch Batch · Ubiquiti Inc · 2026-05-22 · 5 CVEs total

CVE-2026-34910 10.0 CRITICAL Ubiquiti UniFi OS Server 安全漏洞
CVE-2026-34909 10.0 CRITICAL Ubiquiti UniFi OS Server 安全漏洞
CVE-2026-33000 9.1 CRITICAL Ubiquiti UniFi OS Server 安全漏洞
CVE-2026-34911 7.7 HIGH Ubiquiti UniFi OS Server 安全漏洞

IV. Related Vulnerabilities

Same product: UniFi OS Server
Same vendor: Ubiquiti Inc
Same weakness: CWE-284

V. Comments for CVE-2026-34908

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