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CVE-2026-55110 is a Cross-Origin Resource Sharing (CORS) misconfiguration in UniFi OS affecting versions 5.1.15 through 5.1.18 and earlier on affected platforms, including UDM, UNVR, UNAS, and related UniFi OS deployments. The flaw allows a remote, unauthenticated attacker to induce a victim who is already authenticated to UniFi OS to visit a malicious webpage, after which the attacker can cause the victim’s browser to issue cross-origin requests that are accepted by UniFi OS and executed within the context of the victim’s active session. The vulnerability is caused by improper CORS policy enforcement that permits unauthorized cross-origin interaction with privileged application functionality.
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What an attacker gets, and what they’ve been doing with it.
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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.
6 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.