Intel

CVE-2026-54400

unifi_access: Improper Access Control (CVE-2026-54400)

criticalEPSS 0.5%

Affected

  • ui/unifi_access lt *..4.2.29

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.

Source: NVD (NIST)cvelistv5CVE.org (MITRE)BSI WID PortalBSI CSAF

Affected products

The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.

uiunifi_access
4.2.29fixed from 4.2.29

Metrics

XIEM Effective CVSS
9.1
Source: nvd-v3
EPSS percentile
42.7 %
High — this CVE ranks above the median of all CVEs scored today (rank ≥ 36%).
KEV status
—
Show all metrics
Severity
critical
Priority score
81.35
Exploit maturity
no public PoC known
CVSS v3
9.1
EPSS score
0.5 %
Low — model estimates < 1% exploitation likelihood.
Published
2026-07-02 15:17 UTC
CWE
CWE-284

Weakness classes (CWE)

  • CWE-284Pillar

    Improper Access Control

    The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.

    cwe.mitre.org →

References & sources

Reanalysis & status changes

Chronological NVD audit events for this CVE — reanalyses, CVSS updates, CPE diffs.

  1. Reanalysis2026-08-17 15:12 UTC· nvd@nist.gov
    • CPE Configuration: OR *cpe:2.3:a:ui:unifi_access_application:*:*:*:*:*:*:*:* versions up to (excluding) 4.2.29 → OR *cpe:2.3:a:ui:unifi_access:*:*:*:*:*:*:*:* versions up to (excluding) 4.2.29
  2. Initial Analysis2026-07-09 13:21 UTC· nvd@nist.gov
    • CPE Configuration: OR *cpe:2.3:a:ui:unifi_access_application:*:*:*:*:*:*:*:* versions up to (excluding) 4.2.29
    • Reference Type: HackerOne: https://community.ui.com/releases/Security-Advisory-Bulletin-066-066/984eceb3-49c8-4227-942d-671c289b3afc Types: Vendor Advisory
  3. CVE Modified2026-07-02 17:17 UTC· 134c704f-9b21-4f2e-91b3-4a467353bcc0
    • SSVC: {"id":"CVE-2026-54400","role":"CISA Coordinator","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalI…
  4. New CVE Received2026-07-02 15:17 UTC· support@hackerone.com
    • Affected: UniFi Access Application
    • 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 V3.1: AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
    • CWE: CWE-284

Linked advisories