Critical severity · published Jul 2, 2026
CVE-2026-55116
A malicious actor with access to the network and under certain network configurations could exploit an Improper Access Control vulnerability found in certain devices running UniFi…
9.8
CVSS
0.4%
EPSS
No
On KEV
Description
A malicious actor with access to the network and under certain network configurations could exploit an Improper Access Control vulnerability found in certain devices running UniFi OS to make unauthorized changes to such UniFi OS devices.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 35% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CG
Cloud Gateways · Ubiquiti Inc
before 5.1.19 · source: vendor
DM
Dream Machines · Ubiquiti Inc
before 5.1.19 · source: vendor
DR
Dream Routers · Ubiquiti Inc
before 5.1.19 · source: vendor
DW
Dream Wall · Ubiquiti Inc
before 5.1.19 · source: vendor
EF
Enterprise Firewall Core · Ubiquiti Inc
before 5.1.19 · source: vendor
EF
Enterprise Fortress Gateway · Ubiquiti Inc
before 5.1.19 · source: vendor
E7
Express 7 · Ubiquiti Inc
before 5.1.19 · source: vendor
UC
Unifi Connect · UI
before 3.4.20 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-55116
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-55116
Vendor Advisory
https://community.ui.com/releases/Security-Advisory-Bulletin-066-066/984eceb3-49c8-4227-942d-671c289b3afc
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