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CVE-2026-77543 is a critical improper input validation vulnerability in UniFi Access Application 4.3.3 and earlier. Insufficient validation of attacker-controlled input can enable command injection on the underlying host device by a network-reachable, low-privileged attacker. The issue is fixed in UniFi Access Application version 4.3.5.
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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 valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
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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.
An improper input-validation vulnerability in the UniFi Access Application that permits a network-accessible, low-privileged attacker to perform command injection on the host device.
Critical command-injection vulnerability in UniFi Access Application.
Command-injection vulnerability in UniFi Access Application.
A CVSS 9.9 UniFi vulnerability for which the article provides no technical details.
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.