CVE-2026-54400Network attack vector

Host privilege escalation via undisclosed access control flaw

Published Jul 2, 2026 · Updated Jul 2, 2026

Improper access control in Ubiquiti UniFi Access Application 4.2.28 and earlier allows remote authenticated users to gain host privileges. Ubiquiti has not disclosed the affected endpoint or function, or the improper authorization operation performed there. Network access and a highly privileged application account are required; successful exploitation crosses the application boundary and elevates privileges on the host device.

CVSS severity9.1
Critical
EPSS probability0.52%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in Ubiquiti UniFi Access Application 4.2.28 and earlier allows remote authenticated users to gain host privileges. Ubiquiti has not disclosed the affected endpoint or function, or the improper authorization operation performed there. Network access and a highly privileged application account are required; successful exploitation crosses the application boundary and elevates privileges on the host device.

The record

CVE
CVE-2026-54400
Published
Jul 2, 2026
Updated
Jul 2, 2026
Vendor
Ubiquiti Inc.
Product
UniFi Access Application
Classifications
CWE-284, T1068
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 2, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 2, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <4.2.29

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Ubiquiti Inc. · UniFi Access Applicationversion=0 <4.2.29

Published CVSS scores

9.1HackerOneCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-284Improper Access Control
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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