CVE-2026-54400: 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

criticalCVSS 9.1CVE-2026-54400

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.

Details

Source: NVD Recent CVEs (US · database · site)
Severity: critical — CVSS 9.1
Published: 2026-07-02
Last updated: 2026-07-02
Exploitation: Not in CISA KEV at last sync

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-54400

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-544000.26% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 17% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-54400	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

unknownNCSC-2026-0221 [1.00] [M/H] Vulnerabilities fixed in UniFi products from Ubiquiti Networksncsc-nl
high[UPDATE] [high] Ubiquiti UniFi: Multiple vulnerabilitiescert-bund

Recent advisories for A malicious actor

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

highCVE-2026-56842: A malicious actor with access to the network and under certain conditions could exploit an Inc…nvd · 2026-07-02
highCVE-2026-56841: A malicious actor with access to the network and low privileges could exploit an authenticated…nvd · 2026-07-02
highCVE-2026-55119: A malicious actor with access to the network and low privileges could exploit an Improper Acce…nvd · 2026-07-02
highCVE-2026-55118: A malicious actor with access to the network,low privileges and under certain conditions could…nvd · 2026-07-02
highCVE-2026-55117: A malicious actor with access to the network could exploit a Path Traversal vulnerability foun…nvd · 2026-07-02
criticalCVE-2026-55116: A malicious actor with access to the network and under certain network configurations could ex…nvd · 2026-07-02