CVE-2026-77553 — CRITICAL (9.9)

Vulnerability 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.

CVSS Score

9.9

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

CHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

HIGH

Related Weaknesses (CWE)

CWE-284

References

https://community.ui.com/releases/Security-Advisory-Bulletin-067/fc4a3488-7c43-4

FAQ

What is CVE-2026-77553?

CVE-2026-77553 is a vulnerability with a CVSS score of 9.9 (CRITICAL). 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.

How severe is CVE-2026-77553?

CVE-2026-77553 has been rated CRITICAL with a CVSS base score of 9.9/10. This is considered a critical vulnerability requiring immediate attention.

Is there a patch for CVE-2026-77553?

Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.