Vulnerability in Ubiquiti Inc Unifi Protect Ai Key

CVE-2026-77557

A malicious actor with access to the network could exploit an Improper Access Control vulnerability found in UniFi Protect AI Key to escalate privileges on the device.

Published · last modified .

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.005 (44.2th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 44th percentile — 44.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-77557: held from 0.003 to 0.005.

EPSS over last 30 days · oldest: 0.003 · newest: 0.005 · change: +0.002

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-77557?
CVE-2026-77557 is a critical-severity vulnerability in Ubiquiti Inc Unifi Protect Ai Key, classified under Improper Access Control. CVSS score: 9.8/10. Published 2026-08-26.
How severe is CVE-2026-77557?
Critical severity. CVSS v3 base score is 9.8 out of 10.