CVE-2026-77539
Last modified
CVE-2026-77539 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. 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.. EPSS estimates a 0.81% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Weakness Enumeration
Affected Software
Source: CNA advisory (CVE.org). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| Ubiquiti Inc | UniFi OS Server | < 5.1.37 |
References
Timeline
- Published
- Last Modified
- Status
- Deferred
Frequently Asked Questions
What is CVE-2026-77539?
How severe is CVE-2026-77539?
How do I fix CVE-2026-77539?
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-77533A malicious actor with access to the network and low privile…9.9
- CVE-2026-77534A malicious actor with access to the network and low privile…9.9
- CVE-2026-77535A malicious actor with access to the network and high privil…9.1
- CVE-2026-77536A malicious actor with access to the network and low privile…9.9
- CVE-2026-77537A malicious actor with access to the network could exploit a…10
- CVE-2026-77538A malicious actor with access to the network could exploit a…8.2
- CVE-2026-7754IBM Langflow OSS 1.0.0 through 1.10.0 Langflow 1.9.0 could a…6.5
- CVE-2026-77540A malicious actor with access to the network and high privil…9.1
- CVE-2026-77541A malicious actor with access to the network and high privil…9.1
- CVE-2026-77542A malicious actor with access to the network and high privil…9.1
- CVE-2026-77543A malicious actor with access to the network and low privile…9.9
- CVE-2026-77545A malicious actor with access to the network, low privileges…9
Are you affected by CVE-2026-77539?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST