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CVE-2026-54400 is a critical improper access control vulnerability in the UniFi Access Application. The flaw affects UniFi Access versions 4.2.28 and earlier and allows a malicious actor who already has network access and high privileges within the application context to further escalate privileges on the underlying host device. Available information identifies the issue as an access control failure but does not provide the specific vulnerable component, function, or code path. The vulnerability is remotely exploitable over the network, requires no user interaction, and has been assigned a CVSS v3.1 score of 9.1.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
12 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Critical UniFi Access vulnerability caused by insufficient access control, allowing a network-access attacker to escalate privileges on the host system.
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.
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.