CVE-2026-77550

critical

Description

A malicious actor with access to the network could exploit an Improper Neutralization of CRLF Sequences vulnerability found in certain devices running UniFi OS to bypass authentication to such UniFi OS devices or instances.

References

References
More

https://www.bleepingcomputer.com/news/security/ubiquiti-patches-three-max-severity-security-vulnerabilities/

https://cyberscoop.com/ubiquiti-unifi-critical-vulnerabilities-patched/

https://github.com/HORKimhab/CVE-Ubiquiti

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-66399

https://community.ui.com/releases/Security-Advisory-Bulletin-067/fc4a3488-7c43-4628-8bab-f715e96dbfc9

Details

Source: Mitre, NVD

Published: 2026-08-26

Updated: 2026-08-28

Risk Information

CVSS v2

Base Score: 10

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

Severity: Critical

CVSS v3

Base Score: 10

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