CVE-2026-77550 Auth bypass in Cloud Gateways
Network attackers can bypass authentication on UniFi OS devices via CRLF injection, requiring immediate patching by network administrators.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-77550?
CVE-2026-77550 is a critical authentication bypass vulnerability in Ubiquiti Inc Cloud Gateways, published on 26 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-93
Which versions are affected by CVE-2026-77550?
How do I fix CVE-2026-77550?
No fix has been published for CVE-2026-77550 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-77550 being exploited?
There is no known exploitation of CVE-2026-77550 in the wild and no public exploit code.
Sources
Also known as GHSA-grg7-48rg-2r86.