Loading vulnerability…
CVE-2026-55116 is a critical improper access control vulnerability affecting certain devices running Ubiquiti UniFi OS, including reporting that it impacts UniFi OS 5.1.15 and earlier and hardware such as UDM, UDM-Pro, UDM-SE, and related gateway platforms. Under certain network configurations, a remote attacker with network access can exploit the flaw to make unauthorized changes to affected UniFi OS devices. The available source material does not identify the specific vulnerable function, endpoint, or code path, but consistently characterizes the issue as an access control failure that permits unauthorized configuration or system changes.
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.
13 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A critical improper access control vulnerability in Ubiquiti UniFi OS that can allow remote unauthenticated attackers to make unauthorized changes under certain network configurations.
A critical improper access control vulnerability affecting certain Ubiquiti UniFi OS devices that allows unauthorized changes under specific network conditions.
A critical improper access control vulnerability in UniFi OS that can allow unauthorized changes to certain devices by an attacker with network access.
One of six additional critical-severity vulnerabilities patched by Ubiquiti affecting UniFi Talk, UniFi Access, UniFi Protect, UniFi OS Server, and various Ubiquiti devices.
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.