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CVE-2026-34909

CVSS 10.0 · Critical EPSS 0.02% · P6

Possible ATT&CK Techniques 1AI

T1083 · File and Directory Discovery

Affected Version Matrix 32

VendorProductVersion RangeStatus
Ubiquiti IncEFG< 5.1.12affected
Ubiquiti IncENVR< 5.1.12affected
Ubiquiti IncENVR-Core< 5.1.12affected
Ubiquiti IncExpress< 4.0.14affected
Ubiquiti IncExpress 7< 5.1.12affected
Ubiquiti IncUCG-Fiber< 5.1.12affected
Ubiquiti IncUCG-Industrial< 5.1.12affected
Ubiquiti IncUCG-Max< 5.1.12affected
Ubiquiti IncUCG-Ultra< 5.1.12affected
Ubiquiti IncUCK< 5.1.12affected
Ubiquiti IncUCK-Enterprise< 5.1.12affected
Ubiquiti IncUCKP< 5.1.12affected
Ubiquiti IncUDM< 5.1.12affected
Ubiquiti IncUDM-Beast< 5.1.11affected
Ubiquiti IncUDM-Pro< 5.1.12affected
Ubiquiti IncUDM-Pro-Max< 5.1.12affected
Ubiquiti IncUDM-SE< 5.1.12affected
Ubiquiti IncUDR< 5.1.12affected
Ubiquiti IncUDR-5G< 5.1.12affected
Ubiquiti IncUDR7< 5.1.12affected
Ubiquiti IncUDW< 5.1.12affected
Ubiquiti IncUNAS-2< 5.1.10affected
Ubiquiti IncUNAS-4< 5.1.10affected
Ubiquiti IncUNAS-Pro< 5.1.10affected
Ubiquiti IncUNAS-Pro-4< 5.1.10affected
Ubiquiti IncUNAS-Pro-8< 5.1.10affected
Ubiquiti IncUniFi OS Server< 5.0.8affected
Ubiquiti IncUNVR< 5.1.12affected
Ubiquiti IncUNVR-G2< 5.1.12affected
Ubiquiti IncUNVR-G2-Pro< 5.1.12affected
Ubiquiti IncUNVR-Instant< 5.1.12affected
Ubiquiti IncUNVR-Pro< 5.1.12affected
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I. Basic Information for CVE-2026-34909

Vulnerability Information
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Vulnerability Title
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Description
A malicious actor with access to the network could exploit a Path Traversal vulnerability found in UniFi OS devices to access files on the underlying system that could be manipulated to access an underlying account.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: NVD (National Vulnerability Database)
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，该漏洞源于路径遍历，可能导致具有网络访问权限的恶意行为者访问底层系统文件，进而操纵访问底层账户。
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

VendorProductAffected VersionsCPESubscribe
Ubiquiti IncUniFi OS Server 0 ~ 5.0.8 -
Ubiquiti IncExpress 0 ~ 4.0.14 -
Ubiquiti IncUDM 0 ~ 5.1.12 -
Ubiquiti IncUDM-Pro 0 ~ 5.1.12 -
Ubiquiti IncUDM-SE 0 ~ 5.1.12 -
Ubiquiti IncUDM-Pro-Max 0 ~ 5.1.12 -
Ubiquiti IncUDM-Beast 0 ~ 5.1.11 -
Ubiquiti IncEFG 0 ~ 5.1.12 -
Ubiquiti IncUDW 0 ~ 5.1.12 -
Ubiquiti IncUDR 0 ~ 5.1.12 -
Ubiquiti IncUDR7 0 ~ 5.1.12 -
Ubiquiti IncUDR-5G 0 ~ 5.1.12 -
Ubiquiti IncExpress 7 0 ~ 5.1.12 -
Ubiquiti IncUNVR 0 ~ 5.1.12 -
Ubiquiti IncUNVR-Pro 0 ~ 5.1.12 -
Ubiquiti IncUNVR-Instant 0 ~ 5.1.12 -
Ubiquiti IncUNVR-G2 0 ~ 5.1.12 -
Ubiquiti IncUNVR-G2-Pro 0 ~ 5.1.12 -
Ubiquiti IncENVR 0 ~ 5.1.12 -
Ubiquiti IncENVR-Core 0 ~ 5.1.12 -
Ubiquiti IncUNAS-2 0 ~ 5.1.10 -
Ubiquiti IncUNAS-4 0 ~ 5.1.10 -
Ubiquiti IncUNAS-Pro 0 ~ 5.1.10 -
Ubiquiti IncUNAS-Pro-4 0 ~ 5.1.10 -
Ubiquiti IncUNAS-Pro-8 0 ~ 5.1.10 -
Ubiquiti IncUCKP 0 ~ 5.1.12 -
Ubiquiti IncUCK 0 ~ 5.1.12 -
Ubiquiti IncUCK-Enterprise 0 ~ 5.1.12 -
Ubiquiti IncUCG-Ultra 0 ~ 5.1.12 -
Ubiquiti IncUCG-Max 0 ~ 5.1.12 -
Ubiquiti IncUCG-Fiber 0 ~ 5.1.12 -
Ubiquiti IncUCG-Industrial 0 ~ 5.1.12 -

II. Public POCs for CVE-2026-34909

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III. Intelligence Information for CVE-2026-34909

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Vendor Advisories for CVE-2026-34909 (1)

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

CVE-2026-3491010.0 CRITICALUbiquiti UniFi OS Server 安全漏洞
CVE-2026-3490810.0 CRITICALUbiquiti UniFi OS Server 安全漏洞
CVE-2026-330009.1 CRITICALUbiquiti UniFi OS Server 安全漏洞
CVE-2026-349117.7 HIGHUbiquiti UniFi OS Server 安全漏洞

IV. Related Vulnerabilities

Same product: UniFi OS Server
Same vendor: Ubiquiti Inc
Same weakness: CWE-22

V. Comments for CVE-2026-34909

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