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CVE-2026-54400

UI Unifi Access broken access control

9.1 CRITICALEPSS 0.52%
  1. Published2 Jul 2026

Description

A malicious actor with access to the network and high privileges could exploit an Improper Access Control vulnerability found in UniFi Access Application to escalate privileges on the host device.

CVSS 3.1 breakdown

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

Affected products

UI Unifi Access< 4.2.29

Remediation

Fixed in
UI Unifi Access≥ 4.2.29

References

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Frequently asked

Is CVE-2026-54400 being actively exploited?

CVE-2026-54400 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.52%.

How severe is CVE-2026-54400?

CVE-2026-54400 has a CVSS 3.1 base score of 9.1, rated critical. EPSS estimates a 0.52% probability of exploitation.

Which products are affected by CVE-2026-54400?

Affected products include UI Unifi Access.

How do I fix CVE-2026-54400?

Upgrade affected software to a fixed version, for example UI Unifi Access 4.2.29 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-54400 against the real software inventory on every managed device, every day. 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. 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.