High severity · published Jul 2, 2026
CVE-2026-54403
A malicious actor with access to the network could exploit a Path Traversal vulnerability found in certain devices running UniFi OS to bypass authentication of such UniFi OS…
8.6
CVSS
0.8%
EPSS
No
On KEV
Description
A malicious actor with access to the network could exploit a Path Traversal vulnerability found in certain devices running UniFi OS to bypass authentication of such UniFi OS devices or instances.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.8% · higher than 56% 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
CK
Cloud Keys · 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
EV
Enterprise Video Recorders · Ubiquiti Inc
before 5.1.19 · source: vendor
E7
Express 7 · Ubiquiti Inc
before 5.1.19 · source: vendor
NA
Network Attached Storage · Ubiquiti Inc
before 5.1.19 · source: vendor
NV
Network Video Recorders · Ubiquiti Inc
before 5.1.19 · source: vendor
UO
UniFi OS Server · Ubiquiti Inc
before 5.1.19 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-54403
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-54403
Vendor Advisory
https://community.ui.com/releases/Security-Advisory-Bulletin-066-066/984eceb3-49c8-4227-942d-671c289b3afc
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