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NVD / CVE Program· CNA hackerone

CVE-2026-54402: A malicious actor with access to the network and low privileges could exploit an Improper Input Validation vulnerability found in UniFi OS t

Noroxi assessment

Priority: Monitor (action score 36/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 1.7% (FIRST EPSS); higher than 78.1% of all records.
  • Anyone who can reach it over the internet can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Ubiquiti Inc Cloud Gateways 5.1.19; Ubiquiti Inc Cloud Keys 5.1.19; Ubiquiti Inc Dream Machines 5.1.19.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Ubiquiti Inc Cloud Gateways 5.1.19; Ubiquiti Inc Cloud Keys 5.1.19; Ubiquiti Inc Dream Machines 5.1.19 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

A malicious actor with access to the network and low privileges could exploit an Improper Input Validation vulnerability found in UniFi OS to execute a Command Injection on the host device.

HighCVSS 8.8 · v3.1—No exploit Fix available
Published
Jul 2, 2026
Updated
Jul 9, 2026
EPSS
1.7% · 78th percentile

Report tools

JSON

Action score

36

Monitor

Low priority for now.

CVSS
35 / 40 · 8.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
1 / 30 · 1.7%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
8.8
CNA · hackerone
9.9
1.1 point gap

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-54402

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
uiunifi os server
uiunifi dream machine firmware
uiunifi dream machine
uiunifi dream machine pro firmware
uiunifi dream machine pro
uiunifi dream machine special edition firmware
uiunifi dream machine special edition
uiunifi dream machine pro max firmware
uiunifi dream machine pro max
uiunifi dream machine beast firmware
uiunifi dream machine beast
uienterprise fortress gateway firmware

and 51 more

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • ui enterprise firewall core firmwareup to 5.1.18 inclusive
  • ui enterprise fortress gateway firmwareup to 5.1.15 inclusive
  • ui enterprise network video recorder core firmwareup to 5.1.15 inclusive
  • ui enterprise network video recorder firmwareup to 5.1.15 inclusive
  • ui unas 2 firmwareup to 5.1.16 inclusive
  • ui unas 4 firmwareup to 5.1.16 inclusive
  • ui unas pro 4 firmwareup to 5.1.16 inclusive
  • ui unas pro 8 firmwareup to 5.1.16 inclusive
  • ui unas pro firmwareup to 5.1.16 inclusive
  • ui unifi cloud gateway fiber firmwareup to 5.1.15 inclusive
  • ui unifi cloud gateway industrial firmwareup to 5.1.15 inclusive
  • ui unifi cloud gateway max firmwareup to 5.1.15 inclusive
  • ui unifi cloud gateway ultra firmwareup to 5.1.15 inclusive
  • ui unifi cloud key plus firmwareup to 5.1.15 inclusive
  • ui unifi cloudkey enterprise firmwareup to 5.1.15 inclusive
  • ui unifi cloudkey firmwareup to 5.1.15 inclusive
  • ui unifi dream machine beast firmwareup to 5.1.15 inclusive
  • ui unifi dream machine firmwareup to 5.1.15 inclusive
  • ui unifi dream machine pro firmwareup to 5.1.15 inclusive
  • ui unifi dream machine pro max firmwareup to 5.1.15 inclusive

Versions reported by the vendor

Affected version ranges reported by the assigning authority (hackerone). Independent of NVD's CPE analysis and usually ahead of it.

  • Ubiquiti Inc Cloud Gateways

    • before 5.1.19affected · semver

  • Ubiquiti Inc Cloud Keys

    • before 5.1.19affected · semver

  • Ubiquiti Inc Dream Machines

    • before 5.1.19affected · semver

  • Ubiquiti Inc Dream Routers

    • before 5.1.19affected · semver

  • Ubiquiti Inc Dream Wall

    • before 5.1.19affected · semver

  • Ubiquiti Inc Enterprise Firewall Core

    • before 5.1.19affected · semver

  • Ubiquiti Inc Enterprise Fortress Gateway

    • before 5.1.19affected · semver

  • Ubiquiti Inc Enterprise Video Recorders

    • before 5.1.19affected · semver

  • Ubiquiti Inc Express 7

    • before 5.1.19affected · semver

  • Ubiquiti Inc Network Attached Storage

    • before 5.1.19affected · semver

  • Ubiquiti Inc Network Video Recorders

    • before 5.1.19affected · semver

  • Ubiquiti Inc UniFi OS Server

    • before 5.1.19affected · semver

Same product

ui: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-34910A malicious actor with access to the network could exploit an Improper Input Validation vulnerability found in UniFi OS devices to execute aKEV
    97Now
  • CVE-2026-34908A malicious actor with access to the network could exploit an Improper Access Control vulnerability found in UniFi OS devices to make unauthKEV
    97Now
  • CVE-2026-34909A malicious actor with access to the network could exploit a Path Traversal vulnerability found in UniFi OS devices to access files on the uKEV
    91Now

Published before and after this one in the same product

  • ← EarlierCVE-2026-34911May 21, 2026 · A malicious actor with access to the network and low privileges could exploit a Path Traversal vulnerability found in UniFi OS devices to ac
    30Monitor
  • ← EarlierCVE-2026-54401Jul 2, 2026 · A malicious actor with access to the network and low privileges could exploit a Server-Side Request Forgery (SSRF) to escalate privileges wi
    35Monitor
  • Later →CVE-2026-54403Jul 2, 2026 · A malicious actor with access to the network could exploit a Path Traversal vulnerability found in certain devices running UniFi OS to bypas
    34Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Ubiquiti Inc Cloud Gateways5.1.19Vendor (CNA)
Ubiquiti Inc Cloud Keys5.1.19Vendor (CNA)
Ubiquiti Inc Dream Machines5.1.19Vendor (CNA)
Ubiquiti Inc Dream Routers5.1.19Vendor (CNA)
Ubiquiti Inc Dream Wall5.1.19Vendor (CNA)
Ubiquiti Inc Enterprise Firewall Core5.1.19Vendor (CNA)
Ubiquiti Inc Enterprise Fortress Gateway5.1.19Vendor (CNA)
Ubiquiti Inc Enterprise Video Recorders5.1.19Vendor (CNA)
Ubiquiti Inc Express 75.1.19Vendor (CNA)
Ubiquiti Inc Network Attached Storage5.1.19Vendor (CNA)
Ubiquiti Inc Network Video Recorders5.1.19Vendor (CNA)
Ubiquiti Inc UniFi OS Server5.1.19Vendor (CNA)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-3491042 days apartA malicious actor with access to the network could exploit an Improper Input Validation vulnerability found in UniFi OS devices to execute aKEV
    97Now
  • CVE-2026-3300042 days apartA malicious actor with access to the network and high privileges could exploit an Improper Input Validation vulnerability found in UniFi OS
    36Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

  • CVE-2026-544030 days apartA malicious actor with access to the network could exploit a Path Traversal vulnerability found in certain devices running UniFi OS to bypas
    34Monitor

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-20 · Improper Input Validation

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records