PatchTheCVECVE-2026-34910: Ubiquiti UniFi OS Improper Input Validation Vulnerability
CVE-2026-34910 is a critical-severity flaw (CVSS 10.0) affecting unifi os server, unifi cloud gateway industrial firmware, unifi dream machine firmware, reported as exploited in the wild. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
A malicious actor with access to the network could exploit an Improper Input Validation vulnerability found in UniFi OS devices to execute a Command Injection.
Why this priority
- Critical severity
- EPSS top 1%: very likely to be exploited
- Exploited in the wild (CISA KEV)
- Public exploit reference
- CISA SSVC: automatable with total technical impact
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 10.0 (Critical) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 90.0% (top 1%) |
| CISA exploited list | Yes, fix due 2026-06-26 |
| Weakness | CWE-20 |
| Published | 2026-05-22 |
| Last modified | 2026-07-23 |
Last updated 2026-07-23 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Exploited Added to the CISA Known Exploited Vulnerabilities list
- Deadline CISA due date for US federal agencies to patch
- Updated Record last modified
Exact fixes by distribution
Public exploits and detection
Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.
- GitHub PoC: Boreas37/CVE-2026-34910-PoC (13 stars)
- GitHub PoC: gagaltotal/CVE-2026-34910-unifi-poc (0 stars)
- Write-up: www.pwndefend.com/2026/06/09/cve-2026-34910-exploitation-itw-building-a-botnet-mirai/
- Nuclei scan template: UniFi OS Server - Command Injection
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2026-34910?
unifi os server: upgrade to 5.0.8; unifi cloud gateway industrial firmware: upgrade to 5.1.12; unifi dream machine firmware: upgrade to 5.1.12. Exact commands for each OS are on this page.
Is CVE-2026-34910 being exploited?
Yes. CVE-2026-34910 is on the CISA Known Exploited Vulnerabilities list, so treat it as patch-now.
What does CVE-2026-34910 affect?
CVE-2026-34910 affects unifi os server, unifi cloud gateway industrial firmware, unifi dream machine firmware. Severity is critical (CVSS 10.0). A malicious actor with access to the network could exploit an Improper Input Validation vulnerability found in UniFi OS devices to execute a Command Injection.
How urgent is CVE-2026-34910?
Priority 98/100. Critical severity; EPSS top 1%: very likely to be exploited; Exploited in the wild (CISA KEV); Public exploit reference; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action
Software pages
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