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CVE-2026-55110 is a Cross-Origin Resource Sharing (CORS) misconfiguration in Ubiquiti UniFi OS. The flaw allows a remote, unauthenticated attacker to host or control a malicious web page and, if they can induce an authenticated UniFi OS user to visit that page, cause the victim's browser to send cross-origin requests that are accepted by UniFi OS and processed in the context of the victim's active session. As described in the provided material, exploitation can trigger operations in UniFi OS using the authenticated user's session. Affected versions include UniFi OS / Server 5.1.15 through 5.1.18 and earlier, UNAS 5.1.16 and earlier, and EF-Core 5.1.18 and earlier; Ubiquiti indicates fixes are available in UniFi OS 5.1.19 or later.
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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.
5 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A high-severity CORS misconfiguration in Ubiquiti UniFi OS that can let an unauthenticated attacker induce actions through an authenticated user's session.
A high-severity CORS misconfiguration vulnerability in UniFi OS affecting the UDM/UNVR/UNAS family.
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.