What’s Vulnerable › Vulnerabilities
CVE-2026-77540
- Severity: critical (CVSS 9.1 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 1.3% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-08-26 · updated 2026-08-28
- Weakness: CWE-20
Description
A malicious actor with access to the network and high privileges could exploit an Improper Input Validation vulnerability found in UniFi OS Server to execute a Command Injection on the host device.
Affected products
- Ubiquiti Inc UniFi OS Server: before 5.1.37 — fixed in 5.1.37
How to fix
Upgrade to a fixed version: Ubiquiti Inc UniFi OS Server 5.1.37. Check the vendor advisory for mitigations.
References
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