CVE-2026-55116: Improper Access Control in Ubiquiti Inc Cloud Gateways

10

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

Technical severity (critical)+10

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

—

No EPSS score.

Affects

Ubiquiti Inc

Cloud Gateways and 7 more

CVSS base

9.8

Critical · 3 source(s)

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Exploitation

None

none · proof-of-concept · active

Automatable

No

can an attacker script the kill-chain steps

Technical impact

Total

partial · total control of the vulnerable component

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (Ubiquiti Inc Cloud Gateways, Ubiquiti Inc Dream Machines, Ubiquiti Inc Dream Routers…).
The attack is network-based and needs no privileges: restrict exposure (ACLs, VPN, WAF) until patched.
No fix documented in the sources: reduce exposure and monitor the vendor advisory.
Search available logs for exploit probes matching the vulnerability class (access control), errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Ubiquiti Inc	Cloud Gateways	< 5.1.19	Vulnerable	CVE Program (cve.org) e CISA ADP
Ubiquiti Inc	Dream Machines	< 5.1.19	Vulnerable	CVE Program (cve.org) e CISA ADP
Ubiquiti Inc	Dream Routers	< 5.1.19	Vulnerable	CVE Program (cve.org) e CISA ADP
Ubiquiti Inc	Dream Wall	< 5.1.19	Vulnerable	CVE Program (cve.org) e CISA ADP
Ubiquiti Inc	Enterprise Firewall Core	< 5.1.19	Vulnerable	CVE Program (cve.org) e CISA ADP
Ubiquiti Inc	Enterprise Fortress Gateway	< 5.1.19	Vulnerable	CVE Program (cve.org) e CISA ADP
Ubiquiti Inc	Express 7	< 5.1.19	Vulnerable	CVE Program (cve.org) e CISA ADP
Ui	Unifi Connect	< 3.4.20	Vulnerable	NIST National Vulnerability Database

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack vector

Network

Attack complexity

Low

Privileges required

None

User interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

Score	Version	Severity	Expl.	Impact	Scored by
9.8	CVSS 3.1	Critical	3.9	5.9	nvd@nist.gov via NIST National Vulnerability Database
9.0	CVSS 3.1	Critical	2.2	6.0	support@hackerone.com via NIST National Vulnerability Database
9.0	CVSS 3.1	Critical	—	—	hackerone via CVE Program (cve.org) e CISA ADP

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H (score shown at the top: nvd@nist.gov)

Scoring entities (NIST, CNA, ADP) score independently; each score is shown with its origin. For prioritization we use 9.8 (NVD (NIST)) as a conservative provisional reference — not a definitive official score.

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-284 · Improper Access Control

Other CVEs with this weakness →

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).
Audit administrative actions and access to resources outside each user’s normal pattern.

web/proxy/WAF logsnetwork IDS/IPSauthentication logsapplication logs

Timeline

What happened to this CVE, newest first.

2026
Affected products added · ubiquiti inc/dream machines, ubiquiti inc/enterprise fortress gateway, ubiquiti inc/dream wall, ubiquiti inc/dream route
Oct 15, 2026 · CVE Program (cve.org) e CISA ADP
SSVC assessment updated
Oct 15, 2026 · CVE Program (cve.org) e CISA ADP
Record published
Oct 15, 2026
CVSS changed · 9.8
Oct 15, 2026 · NIST National Vulnerability Database
Source status changed · → Undergoing Analysis
Oct 15, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 15, 2026 · NIST National Vulnerability Database
CVE published
Jul 2, 2026 · hackerone

Source activity

Repeated readings are counted rather than listed.

1× Official description updated · Oct 15, 2026 – Oct 15, 2026

References

1 on the record

community.ui.com/releases/Security-Advisory-Bulletin-066-066/984eceb3-49c8-4227-942d-6
Vendor Advisory, NIST National Vulnerability Database

Elsewhere on this site

Ubiquiti Inc
every CVE for this vendor

Access control
same class

CWE-284
other pages naming this weakness

Related CVEs (same products)

High CVE-2026-55112 Improper Access Control in Ui Unifi Dream Machine Pro Firmware Jul 2, 2026
High CVE-2026-54404 SQL Injection in Ui Unifi Dream Machine Beast Firmware Jul 2, 2026
Medium CVE-2026-55110 Permissive Cross-domain Policy in Ui Unifi Os Server Jul 2, 2026
High CVE-2026-54401 Server-Side Request Forgery (SSRF) in Ui Unifi Os Server Jul 2, 2026
High CVE-2026-54403 Path Traversal in Ui Unifi Os Server Jul 2, 2026
High CVE-2026-54402 Command Injection in Ui Unifi Os Server Jul 2, 2026

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No FIRST EPSS score.
No fixed version, patch or mitigation documented.
No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-55116 is "Improper Access Control in Ubiquiti Inc Cloud Gateways", rated Critical. It affects Cloud Gateways (Ubiquiti Inc); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 9.8 describes technical severity. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

Comments

Moderated technical discussion. Read the community guidelines.

No comments yet.

Sign in or create an account to comment and suggest corrections.