Intel

CVE-2026-77553

UniFi: Improper Access Control (CVE-2026-77553)

criticalEPSS 0.5%

Affected

  • Ubiquiti/UniFi = OS..OS

Description

A malicious actor with access to the network and low privileges could exploit an Improper Access Control vulnerability found in UniFi Access Application to escalate privileges on the host device.

Source: BSI WID PortalBSI CSAFNVD (NIST)CVE.org (MITRE)cvelistv5

Affected products

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

UbiquitiUniFi
OS

Metrics

XIEM Effective CVSS
9.9
Source: cna-v3
EPSS percentile
38.6 %
High — this CVE ranks above the median of all CVEs scored today (rank ≥ 36%).
KEV status
—
Show all metrics
Severity
critical
Priority score
88.52
Exploit maturity
no public PoC known
CVSS v3
9.9
EPSS score
0.5 %
Low — model estimates < 1% exploitation likelihood.
Published
2026-08-26 11:16 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