Ubiquiti UniFi OS Server prior 5.0.8 path traversal

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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5.9$0-$5k0.00

Summaryinfo

A vulnerability was found in Ubiquiti UniFi OS Server, UDM, UDM-Pro, UDM-SE, UDM-Pro-Max, UDM-Beast, EFG, UDW, UDR, UDR7, UDR-5G, Express 7, UNVR, UNVR-Pro, UNVR-Instant, UNVR-G2, UNVR-G2-Pro, ENVR, ENVR-Core, UNAS-2, UNAS-4, UNAS-Pro, UNAS-Pro-4, UNAS-Pro-8, UCKP, UCK, UCK-Enterprise, UCG-Ultra, UCG-Max, UCG-Fiber and UCG-Industrial. It has been rated as critical. Affected by this issue is some unknown functionality. This manipulation causes path traversal. This vulnerability appears as CVE-2026-34911. The attack may be initiated remotely. There is no available exploit. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as critical was found in Ubiquiti UniFi OS Server, UDM, UDM-Pro, UDM-SE, UDM-Pro-Max, UDM-Beast, EFG, UDW, UDR, UDR7, UDR-5G, Express 7, UNVR, UNVR-Pro, UNVR-Instant, UNVR-G2, UNVR-G2-Pro, ENVR, ENVR-Core, UNAS-2, UNAS-4, UNAS-Pro, UNAS-Pro-4, UNAS-Pro-8, UCKP, UCK, UCK-Enterprise, UCG-Ultra, UCG-Max, UCG-Fiber and UCG-Industrial. Affected by this vulnerability is an unknown function. The manipulation with an unknown input leads to a path traversal vulnerability. The CWE definition for the vulnerability is CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. As an impact it is known to affect confidentiality. The summary by CVE is:

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.

The advisory is shared at community.ui.com. This vulnerability is known as CVE-2026-34911 since 03/31/2026. The exploitation appears to be easy. The attack can be launched remotely. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1006 for this issue.

Upgrading to version 5.0.8 eliminates this vulnerability. The upgrade is hosted for download at community.ui.com.

The vulnerability is also documented in the databases at EUVD (EUVD-2026-31387) and CERT Bund (WID-SEC-2026-1639). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Affected

  • Ubiquiti UniFi

Productinfo

Vendor

Name

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.0
VulDB Meta Temp Score: 5.9

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 7.7
CNA Vector (hackerone): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Path traversal
CWE: CWE-22
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: UniFi OS Server/UDM/UDM-Pro/UDM-SE/UDM-Pro-Max/UDM-Beast/EFG/UDW/UDR/UDR7/UDR-5G/Express 7/UNVR/UNVR-Pro/UNVR-Instant/UNVR-G2/UNVR-G2-Pro/ENVR/ENVR-Core/UNAS-2/UNAS-4/UNAS-Pro/UNAS-Pro-4/UNAS-Pro-8/UCKP/UCK/UCK-Enterprise/UCG-Ultra/UCG-Max/UCG-Fiber/UCG-Industrial 5.0.8

Timelineinfo

03/31/2026 CVE reserved
05/22/2026 +52 days Advisory disclosed
05/22/2026 +0 days VulDB entry created
05/22/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: community.ui.com
Status: Confirmed

CVE: CVE-2026-34911 (🔒)
GCVE (CVE): GCVE-0-2026-34911
GCVE (VulDB): GCVE-100-365113
EUVD: 🔒
CERT Bund: WID-SEC-2026-1639 - Ubiquiti UniFi OS Server: Mehrere Schwachstellen

Entryinfo

Created: 05/22/2026 06:08
Updated: 05/22/2026 15:27
Changes: 05/22/2026 06:08 (63), 05/22/2026 11:01 (7), 05/22/2026 15:27 (1)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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