# CVE-2026-54400 — Ubiquiti Inc UniFi Access Application

> As of 2026-07-02, CVE-2026-54400 is a CRITICAL-severity vulnerability in Ubiquiti Inc UniFi Access Application, CVSS v3.1 9.1, EPSS 0.5% (42.7th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-54400, most recently “CVE-2026-50746: Critical Unauthenticated Command Injection in Ubiquiti UniFi Connect Application (CVSS 10.0)”.

**Last updated:** 2026-07-02

## What is 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 the host device.

The record classifies CVE-2026-54400 under weakness class [CWE-284](https://intel.threadlinqs.com/cwe/CWE-284). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs high-privilege credentials, needs no user interaction, and has high impact on confidentiality, integrity, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 118 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 9.1 — CRITICAL (`CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H`)
- **EPSS (FIRST):** 0.5% probability of exploitation in the next 30 days, higher than 42.7% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 6.3/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-07-02

## Is CVE-2026-54400 being exploited?

It currently carries a trending score of 21 in the Threadlinqs vulnerability feed.

## Affected products and versions

- [Ubiquiti Inc](https://intel.threadlinqs.com/vendors/ubiquiti): UniFi Access Application

## How to fix CVE-2026-54400

No vendor patch reference has been recorded for CVE-2026-54400 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-54400

1 tracked threat in the Threadlinqs corpus references CVE-2026-54400, either in the campaign’s CVE list or as an indicator on the campaign record.

- [CVE-2026-50746: Critical Unauthenticated Command Injection in Ubiquiti UniFi Connect Application (CVSS 10.0)](https://intel.threadlinqs.com/threat/TL-2026-1159) — CRITICAL · 2026-07-10

## Sources

Enriched from CVE.org, FIRST EPSS. Last verified by Threadlinqs on 2026-10-10.

**Other references**

- [community.ui.com](https://community.ui.com/releases/Security-Advisory-Bulletin-066-066/984eceb3-49c8-4227-942d-671c289b3afc)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-54400
Full detection coverage and IOCs for threats exploiting CVE-2026-54400 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp