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CVE-2026-54400 is a critical improper access control vulnerability in the Ubiquiti UniFi Access Application. According to the provided content, a malicious actor with network access and already high privileges can exploit the flaw to further escalate privileges on the host device. The issue affects UniFi Access Application version 4.2.28 and earlier and was fixed in version 4.2.29. No vulnerable function, endpoint, or code path is identified in the provided material.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A critical privilege escalation vulnerability in Ubiquiti UniFi Access Application caused by improper access control.
A critical improper access control vulnerability in UniFi Access Application that can allow privilege escalation on the host device.
One of six additional critical-severity vulnerabilities patched by Ubiquiti affecting UniFi Talk, UniFi Access, UniFi Protect, UniFi OS Server, and various Ubiquiti devices.
A critical improper access control vulnerability in UniFi Access that enables privilege escalation but requires high privileges.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.