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CVE-2026-34911

Quick assessment

Affected
Ubiquiti Inc UniFi OS Server
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
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和低权限的恶意行为者访问底层系统文件，进而操纵获取敏感信息。

CVSS 7.7 · High EPSS 0.59% · P46

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-2026-34911

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 and low privileges could exploit a Path Traversal vulnerability found in UniFi OS devices to access files on the underlying system that could be manipulated to obtain sensitive information.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
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和低权限的恶意行为者访问底层系统文件，进而操纵获取敏感信息。
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-2026-34911

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III. Intelligence Information for CVE-2026-34911

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Vendor Advisories for CVE-2026-34911 (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-2026-34908 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

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-34911

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