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CVE-2026-55116

UI Unifi Connect broken access control

9.0 CRITICALEPSS 0.41%
  1. Published2 Jul 2026

Description

A malicious actor with access to the network and under certain network configurations could exploit an Improper Access Control vulnerability found in certain devices running UniFi OS to make unauthorized changes to such UniFi OS devices.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityHigh
Privileges requiredNone
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

Affected products

UI Unifi Connect< 3.4.20

Remediation

Fixed in
UI Unifi Connect≥ 3.4.20

References

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Frequently asked

Is CVE-2026-55116 being actively exploited?

CVE-2026-55116 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.41%.

How severe is CVE-2026-55116?

CVE-2026-55116 has a CVSS 3.1 base score of 9.0, rated critical. EPSS estimates a 0.41% probability of exploitation.

Which products are affected by CVE-2026-55116?

Affected products include UI Unifi Connect.

How do I fix CVE-2026-55116?

Upgrade affected software to a fixed version, for example UI Unifi Connect 3.4.20 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-55116 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

See how prioritisation worksBook a demo

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.