Intel

CVE-2026-55116

unifi_connect: Improper Access Control (CVE-2026-55116)

criticalEPSS 0.4%

Affected

  • ui/unifi_connect lt *..3.4.20

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.

Source: BSI WID PortalBSI CSAFNVD (NIST)cvelistv5CVE.org (MITRE)

Affected products

The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.

uiunifi_connect
3.4.20fixed from 3.4.20

Metrics

XIEM Effective CVSS
9.8
Source: nvd-v3
EPSS percentile
33.5 %
Elevated — this CVE ranks above at least 10% of all CVEs scored today.
KEV status
—
Show all metrics
Severity
critical
Priority score
75.21
Exploit maturity
no public PoC known
CVSS v3
9.0
EPSS score
0.4 %
Low — model estimates < 1% exploitation likelihood.
Published
2026-07-02 15:17 UTC
CWE
CWE-284

Weakness classes (CWE)

  • CWE-284Pillar

    Improper Access Control

    The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.

    cwe.mitre.org →

References & sources

Reanalysis & status changes

Chronological NVD audit events for this CVE — reanalyses, CVSS updates, CPE diffs.

  1. Initial Analysis2026-07-09 18:14 UTC· nvd@nist.gov
    • CVSS V3.1: AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    • CWE: NVD-CWE-Other
    • CPE Configuration: OR *cpe:2.3:a:ui:unifi_connect:*:*:*:*:*:*:*:* versions up to (excluding) 3.4.20
    • Reference Type: HackerOne: https://community.ui.com/releases/Security-Advisory-Bulletin-066-066/984eceb3-49c8-4227-942d-671c289b3afc Types: Vendor Advisory
  2. CVE Modified2026-07-02 16:16 UTC· 134c704f-9b21-4f2e-91b3-4a467353bcc0
    • SSVC: {"id":"CVE-2026-55116","role":"CISA Coordinator","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalI…
  3. New CVE Received2026-07-02 15:17 UTC· support@hackerone.com
    • Affected: Dream Machines, Enterprise Fortress Gateway, Dream Wall (+4)
    • 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 V3.1: AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
    • CWE: CWE-284

Linked advisories