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CVE-2026-34909

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。

CVSS 10.0 · Critical KEV EPSS 1.79% · P78

Possible ATT&CK Techniques 1 AI

T1083 · File and Directory Discovery

Affected Version Matrix 32

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 < 4.0.14 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-2026-34909

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
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: 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
对路径名的限制不恰当(路径遍历)
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

Vendor Product Affected Versions CPE Subscribe
Ubiquiti Inc UniFi OS Server 0 ~ 5.0.8 -
Ubiquiti Inc Express 0 ~ 4.0.14 -
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 -

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-2026-34910 10.0 CRITICAL Ubiquiti UniFi OS Server 安全漏洞
CVE-2026-34908 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-22

V. Comments for CVE-2026-34909

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