Loading vulnerability…
CVE-2026-54403 is a path traversal vulnerability affecting certain UniFi OS devices and instances. The flaw allows a remote attacker on the network to leverage path traversal behavior to bypass authentication controls on affected UniFi OS deployments. Available reporting characterizes the issue as exploitable by a low-privileged attacker, while also noting that it may be chainable with other vulnerabilities to remove or bypass that low-privilege requirement entirely in some attack paths. Affected versions include UniFi OS / Server 5.1.15 and earlier, UniFi OS 5.1.18 and earlier as referenced in advisory summaries, UniFi Network Attached Storage 5.1.16 and earlier for impacted subsets, and EF-Core 5.1.18 and earlier where UniFi OS vulnerabilities apply.
Mallory correlates every CVE against your assets, your vendors, and active adversary campaigns. Know which vulnerabilities matter for you, not just which ones are loud.
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.
If you can’t patch tonight, do this now.
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.
5 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.