Ubiquiti UniFi OS Server up to 5.0.7 input validation

Summaryinfo

A vulnerability marked as very critical has been reported 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 up to 5.0.7. Impacted is an unknown function. The manipulation leads to input validation. This vulnerability is uniquely identified as CVE-2026-34910. The attack is possible to be carried out remotely. Moreover, an exploit is present. It is suggested to upgrade the affected component.

Detailsinfo

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 up to 5.0.7 and classified as very critical. This issue affects an unknown code. The manipulation with an unknown input leads to a input validation vulnerability. Using CWE to declare the problem leads to CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

A malicious actor with access to the network could exploit an Improper Input Validation vulnerability found in UniFi OS devices to execute a Command Injection.

The advisory is shared at community.ui.com. The identification of this vulnerability is CVE-2026-34910 since 03/31/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are unknown but an exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 06/23/2026).

It is declared as attacked. The CISA Known Exploited Vulnerabilities Catalog lists this issue since 06/23/2026 with a due date of 06/26/2026:

Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BO

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 vulnerability database at CERT Bund (WID-SEC-2026-1639). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Affected

• Ubiquiti UniFi

Productinfo

Vendor

• Ubiquiti

Name

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

Version

• 5.0.0
• 5.0.1
• 5.0.2
• 5.0.3
• 5.0.4
• 5.0.5
• 5.0.6
• 5.0.7

License

• commercial

CPE 2.3info

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CPE 2.2info

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Exploitinginfo

Threat Intelligenceinfo

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Sourcesinfo

Entryinfo

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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