CVE-2026-77536: 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 12 more

CVSS base

9.9

Critical · 2 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 Cloud Keys, Ubiquiti Inc Dream Machines…).
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	< 5.1.31	Vulnerable	CVE Program (cve.org) e CISA ADP
Ubiquiti Inc	Cloud Keys	< 5.1.31	Vulnerable	CVE Program (cve.org) e CISA ADP
Ubiquiti Inc	Dream Machines	< 5.1.31	Vulnerable	CVE Program (cve.org) e CISA ADP
Ubiquiti Inc	Dream Routers	< 5.1.31	Vulnerable	CVE Program (cve.org) e CISA ADP
Ubiquiti Inc	Dream Wall	< 5.1.31	Vulnerable	CVE Program (cve.org) e CISA ADP
Ubiquiti Inc	Enterprise Firewall Core	< 5.1.31	Vulnerable	CVE Program (cve.org) e CISA ADP
Ubiquiti Inc	Enterprise Fortress Gateway	< 5.1.31	Vulnerable	CVE Program (cve.org) e CISA ADP
Ubiquiti Inc	Enterprise Network Attached Storage	< 5.1.31	Vulnerable	CVE Program (cve.org) e CISA ADP
Ubiquiti Inc	Enterprise Network Video Recorders	< 5.1.31	Vulnerable	CVE Program (cve.org) e CISA ADP
Ubiquiti Inc	Express 7	< 5.1.31	Vulnerable	CVE Program (cve.org) e CISA ADP
Ubiquiti Inc	Network Attached Storage	< 5.1.32	Vulnerable	CVE Program (cve.org) e CISA ADP
Ubiquiti Inc	Network Video Recorders	< 5.1.31	Vulnerable	CVE Program (cve.org) e CISA ADP
Ubiquiti Inc	UniFi OS Server	< 5.1.37	Vulnerable	CVE Program (cve.org) e CISA ADP

Attack characteristics

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

Attack vector

Network

Attack complexity

Low

Privileges required

Low

User interaction

None

Scope

Changed

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
9.9	CVSS 3.1	Critical	3.1	6.0	fe490ce8-0395-4072-90d8-2707e1bdf984 via NIST National Vulnerability Database
9.9	CVSS 3.1	Critical	—	—	Ubiquiti via CVE Program (cve.org) e CISA ADP

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H (score shown at the top: fe490ce8-0395-4072-90d8-2707e1bdf984)

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/unifi os server, ubiquiti inc/cloud keys, ubiquiti inc/network video recorders, ubiquiti inc/enterprise net
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 · 9.9
Oct 15, 2026 · NIST National Vulnerability Database
Source status changed · → Deferred
Oct 15, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 15, 2026 · NIST National Vulnerability Database
CVE published
Aug 26, 2026 · Ubiquiti

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-067/fc4a3488-7c43-4628-8bab-f715e
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)

Critical CVE-2026-77549 A malicious actor with access to the network and under certain conditions could exploit… Aug 26, 2026
Critical CVE-2026-77550 A malicious actor with access to the network could exploit an Improper Neutralization of… Aug 26, 2026
Critical CVE-2026-77545 A malicious actor with access to the network, low privileges and under certain… Aug 26, 2026
Critical CVE-2026-77540 Improper Input Validation in Ubiquiti Inc UniFi OS Server Aug 26, 2026
Critical CVE-2026-77539 Improper Input Validation in Ubiquiti Inc UniFi OS Server Aug 26, 2026
Critical CVE-2026-77534 Improper Access Control in Ubiquiti Inc UniFi OS Server Aug 26, 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-2026-77536 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 9.9 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.

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