NVD / CVE Program· CNA hackerone

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 bypas

Noroxi assessment

Priority: Monitor (action score 34/100)

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: 0.77% (FIRST EPSS); higher than 55.5% of all records.
Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
According to CISA the attack is automatable: targets can be found by mass scanning.
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 could exploit a Path Traversal vulnerability found in certain devices running UniFi OS to bypass authentication of such UniFi OS devices or instances.

HighCVSS 8.6 · v3.1—No exploit Fix available

Published: Jul 2, 2026
Updated: Jul 9, 2026
EPSS: 0.7% · 55th percentile
CWE: CWE-22

Report tools

JSON

Action score

Monitor

Low priority for now.

CVSS: 34 / 40 · 8.6 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.7%

CISA SSVC decision

Exploitation: none
Automatable: yes
Technical impact: partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: —
CNA · hackerone: 8.6; NVD has not scored this yet; the score shown is the CNA’s.

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.

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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.

Vendor	Product	CPE
ui	unifi os server	cpe:2.3:a:ui:unifi_os_server
ui	unifi dream machine firmware	cpe:2.3:o:ui:unifi_dream_machine_firmware
ui	unifi dream machine	cpe:2.3:h:ui:unifi_dream_machine
ui	unifi dream machine pro firmware	cpe:2.3:o:ui:unifi_dream_machine_pro_firmware
ui	unifi dream machine pro	cpe:2.3:h:ui:unifi_dream_machine_pro
ui	unifi dream machine special edition firmware	cpe:2.3:o:ui:unifi_dream_machine_special_edition_firmware
ui	unifi dream machine special edition	cpe:2.3:h:ui:unifi_dream_machine_special_edition
ui	unifi dream machine pro max firmware	cpe:2.3:o:ui:unifi_dream_machine_pro_max_firmware
ui	unifi dream machine pro max	cpe:2.3:h:ui:unifi_dream_machine_pro_max
ui	unifi dream machine beast firmware	cpe:2.3:o:ui:unifi_dream_machine_beast_firmware
ui	unifi dream machine beast	cpe:2.3:h:ui:unifi_dream_machine_beast
ui	enterprise fortress gateway firmware	cpe:2.3:o:ui:enterprise_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
96Now
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
90Now

Published before and after this one in the same product

← 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
← EarlierCVE-2026-54402Jul 2, 2026 · A malicious actor with access to the network and low privileges could exploit an Improper Input Validation vulnerability found in UniFi OS t
36Monitor
Later →CVE-2026-55110Jul 2, 2026 · A malicious actor who lures an authenticated user to a malicious page could exploit a Cross-Origin Resource Sharing (CORS) misconfiguration
24Monitor

Remediation

Which version to upgrade to

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

Product / package	Fixed version	Source
Ubiquiti Inc Cloud Gateways	5.1.19	Vendor (CNA)
Ubiquiti Inc Cloud Keys	5.1.19	Vendor (CNA)
Ubiquiti Inc Dream Machines	5.1.19	Vendor (CNA)
Ubiquiti Inc Dream Routers	5.1.19	Vendor (CNA)
Ubiquiti Inc Dream Wall	5.1.19	Vendor (CNA)
Ubiquiti Inc Enterprise Firewall Core	5.1.19	Vendor (CNA)
Ubiquiti Inc Enterprise Fortress Gateway	5.1.19	Vendor (CNA)
Ubiquiti Inc Enterprise Video Recorders	5.1.19	Vendor (CNA)
Ubiquiti Inc Express 7	5.1.19	Vendor (CNA)
Ubiquiti Inc Network Attached Storage	5.1.19	Vendor (CNA)
Ubiquiti Inc Network Video Recorders	5.1.19	Vendor (CNA)
Ubiquiti Inc UniFi OS Server	5.1.19	Vendor (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.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

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-2026-3490942 days apartA malicious actor with access to the network could exploit a Path Traversal vulnerability found in UniFi OS devices to access files on the uKEV
90Now
CVE-2026-3491142 days apartA malicious actor with access to the network and low privileges could exploit a Path Traversal vulnerability found in UniFi OS devices to ac
30Monitor

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-2026-544020 days apartA malicious actor with access to the network and low privileges could exploit an Improper Input Validation vulnerability found in UniFi OS t
36Monitor
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
CVE-2026-544010 days apartA malicious actor with access to the network and low privileges could exploit a Server-Side Request Forgery (SSRF) to escalate privileges wi
35Monitor
CVE-2026-3491142 days apartA malicious actor with access to the network and low privileges could exploit a Path Traversal vulnerability found in UniFi OS devices to ac
30Monitor

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.

TR-26-0490 · Jul 3, 2026(Ubiquiti UniFi Güvenlik Bildirimi)

All national notices →

Technical details

Attack conditions

Anyone who can reach it over the internet can trigger it.
No account or password is required.
No user action is required.
No special conditions are required; it is repeatable.

If successful

Confidentiality: high · data can be read
Integrity: none
Availability: none

Impact can extend beyond the vulnerable component (scope changes).

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: Changed
Confidentiality impact: High
Integrity impact: None
Availability impact: None

Weakness class (CWE)

CWE-22 · Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

CVSS vector

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

nvd-secondary

Root cause

A user-supplied file name is joined with the allowed directory, but the result is never checked to confirm it is still inside that directory.

The bug in code

The whole CWE-22 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1const file = path.join(ROOT, req.query.name);
2res.sendFile(file);

Fixed

1const file = path.resolve(ROOT, req.query.name);
2if (!file.startsWith(ROOT + path.sep)) {
3  return res.sendStatus(400);
4}
5res.sendFile(file);

Attack context

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

Attack patterns (CAPEC)

ATT&CK techniques

—

Change log

Fix✗ → ✓Sep 28, 2026, 10:11 PM UTC

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

References

community.ui.com/releases/Security-Advisory-Bulletin-066-066/984eceb3-49c8-4227-942d-671c289b3afc

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

All records