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CVE-2026-54403 is a path traversal vulnerability affecting certain devices and instances running Ubiquiti UniFi OS. According to the provided advisory content, a malicious actor with network access can exploit the flaw to bypass authentication on affected UniFi OS devices or instances. The issue is described as a path traversal bug and is rated CVSS 8.6. The supplied material does not identify the specific vulnerable endpoint, file-handling routine, or function, so more granular technical root-cause detail is currently not available from the provided context.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
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.
4 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A high-severity path traversal vulnerability in Ubiquiti UniFi OS that can allow authentication bypass; the advisory also notes formal CVSS metrics list Privileges Required as None.
A high-severity path traversal vulnerability in UniFi OS that is especially dangerous because it can be chained with other flaws to bypass low-privilege access requirements.
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.