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CVE-2026-34908

Ubiquiti UniFi OS Improper Access Control

10.0 CRITICALActively exploited (CISA KEV)Public exploitEPSS 15.2%
  1. Published22 May 2026
  2. Added to CISA KEV23 Jun 2026
  3. Remediation due26 Jun 2026
Actively exploited (CISA KEV)

Ubiquiti UniFi OS contains an improper access control vulnerability which could allow a malicious actor with access to the network to make unauthorized changes to the system.

Added to KEV: 23 Jun 2026Federal remediation due: 26 Jun 2026

Description

A malicious actor with access to the network could exploit an Improper Access Control vulnerability found in UniFi OS devices to make unauthorized changes to the system.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Affected products

UI Unifi OS Server< 5.0.8
UI Enterprise Fortress Gateway Firmware< 5.1.12
UI Enterprise Network Video Recorder Core Firmware< 5.1.12
UI Enterprise Network Video Recorder Firmware< 5.1.12
UI Unas 2 Firmware< 5.1.10
UI Unas 4 Firmware< 5.1.10
UI Unas Pro 4 Firmware< 5.1.10
UI Unas Pro 8 Firmware< 5.1.10
UI Unas Pro Firmware< 5.1.10
UI Unifi Cloud Gateway Fiber Firmware< 5.1.12
UI Unifi Cloud Gateway Industrial Firmware< 5.1.12
UI Unifi Cloud Gateway Max Firmware< 5.1.12
UI Unifi Cloud Gateway Ultra Firmware< 5.1.12
UI Unifi Cloudkey Enterprise Firmware< 5.1.12
UI Unifi Cloudkey Firmware< 5.1.12
UI Unifi Cloud Key Plus Firmware< 5.1.12
UI Unifi Dream Machine Beast Firmware< 5.1.11
UI Unifi Dream Machine Firmware< 5.1.12
UI Unifi Dream Machine Pro Firmware< 5.1.12
UI Unifi Dream Machine Pro Max Firmware< 5.1.12
UI Unifi Dream Machine Special Edition Firmware< 5.1.12
UI Unifi Dream Router 5g Max Firmware< 5.1.12
UI Unifi Dream Router 7 Firmware< 5.1.12
UI Unifi Dream Router Firmware< 5.1.12

Remediation

Fixed in
UI Unifi OS Server≥ 5.0.8
UI Enterprise Fortress Gateway Firmware≥ 5.1.12
UI Enterprise Network Video Recorder Core Firmware≥ 5.1.12
UI Enterprise Network Video Recorder Firmware≥ 5.1.12
UI Unas 2 Firmware≥ 5.1.10
UI Unas 4 Firmware≥ 5.1.10
UI Unas Pro 4 Firmware≥ 5.1.10
UI Unas Pro 8 Firmware≥ 5.1.10
UI Unas Pro Firmware≥ 5.1.10
UI Unifi Cloud Gateway Fiber Firmware≥ 5.1.12

References

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Frequently asked

Is CVE-2026-34908 being actively exploited?

Yes. CVE-2026-34908 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 23 Jun 2026.

How severe is CVE-2026-34908?

CVE-2026-34908 has a CVSS 3.1 base score of 10.0, rated critical. EPSS estimates a 15.2% probability of exploitation.

Which products are affected by CVE-2026-34908?

Affected products include UI Unifi OS Server, UI Enterprise Fortress Gateway Firmware, UI Enterprise Network Video Recorder Core Firmware, UI Enterprise Network Video Recorder Firmware, UI Unas 2 Firmware, and 19 more.

How do I fix CVE-2026-34908?

Upgrade affected software to a fixed version, for example UI Unifi OS Server 5.0.8, UI Enterprise Fortress Gateway Firmware 5.1.12, UI Enterprise Network Video Recorder Core Firmware 5.1.12 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-34908 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, a risk for it never ranks below high, and the update that fixes it moves to the Emergency patch lane. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.