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.
SeverityCritical
CVSS10.0
Exploit probability—
Product
UniFi OS Server
PublishedAug 26, 2026
First seenAug 26, 2026
Weakness typeCWE-93CWE-93
How to fix
Update
- Ubiquiti Inc UniFi OS Server5.1.37 or later
- Ubiquiti Inc Cloud Keys5.1.31 or later
- Ubiquiti Inc Network Video Recorders5.1.31 or later
- Ubiquiti Inc Enterprise Network Video Recorders5.1.31 or later
- Ubiquiti Inc Enterprise Network Attached Storage5.1.31 or later
- Ubiquiti Inc Dream Machines5.1.31 or later
- Ubiquiti Inc Enterprise Firewall Core5.1.31 or later
- Ubiquiti Inc Dream Routers5.1.31 or later
- Ubiquiti Inc Enterprise Fortress Gateway5.1.31 or later
- Ubiquiti Inc Cloud Gateways5.1.31 or later
- Ubiquiti Inc Dream Wall5.1.31 or later
- Ubiquiti Inc Express 75.1.31 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Ubiquiti Inc UniFi OS Server | v < 5.1.37 | 5.1.37 |
| Ubiquiti Inc Cloud Keys | v < 5.1.31 | 5.1.31 |
| Ubiquiti Inc Network Video Recorders | v < 5.1.31 | 5.1.31 |
| Ubiquiti Inc Enterprise Network Video Recorders | v < 5.1.31 | 5.1.31 |
| Ubiquiti Inc Enterprise Network Attached Storage | v < 5.1.31 | 5.1.31 |
| Ubiquiti Inc Dream Machines | v < 5.1.31 | 5.1.31 |
| Ubiquiti Inc Enterprise Firewall Core | v < 5.1.31 | 5.1.31 |
| Ubiquiti Inc Dream Routers | v < 5.1.31 | 5.1.31 |
| Ubiquiti Inc Enterprise Fortress Gateway | v < 5.1.31 | 5.1.31 |
| Ubiquiti Inc Cloud Gateways | v < 5.1.31 | 5.1.31 |
| Ubiquiti Inc Dream Wall | v < 5.1.31 | 5.1.31 |
| Ubiquiti Inc Express 7 | v < 5.1.31 | 5.1.31 |
| Ubiquiti Inc Network Attached Storage | v < 5.1.32 | 5.1.32 |
| Ubiquiti Inc Express | v < 4.0.17 | 4.0.17 |
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