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Fencer Intel
critical 10.0

CVE-2026-34910 kev in the critical feed json

A malicious actor with access to the network could exploit an Improper Input Validation vulnerability found in UniFi OS devices to execute…

published 5mo ago modified 3mo ago also EUVD-2026-31382

cvss
10.0
version 3.1, CNA
cisa kev
Exploited
added 2026-06-23
epss
90.0%
EPSS 90.0% chance of exploitation in 30 days, percentile 99.7%
public exploits
0
none known, plus a Nuclei check

Summary

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.

Patch / fix

cisa required action Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

  • Ubiquiti Inc UniFi OS Server 5.0.8
  • Ubiquiti Inc UDM 5.1.12
  • Ubiquiti Inc UDM-Pro 5.1.12
  • Ubiquiti Inc UDM-SE 5.1.12
  • Ubiquiti Inc UDM-Pro-Max 5.1.12
  • Ubiquiti Inc UDM-Beast 5.1.11
  • Ubiquiti Inc EFG 5.1.12
  • Ubiquiti Inc UDW 5.1.12
  • Ubiquiti Inc UDR 5.1.12
  • Ubiquiti Inc UDR7 5.1.12
  • Ubiquiti Inc UDR-5G 5.1.12
  • Ubiquiti Inc Express 7 5.1.12
  • Ubiquiti Inc UNVR 5.1.12
  • Ubiquiti Inc UNVR-Pro 5.1.12
  • Ubiquiti Inc UNVR-Instant 5.1.12
  • Ubiquiti Inc UNVR-G2 5.1.12
  • Ubiquiti Inc UNVR-G2-Pro 5.1.12
  • Ubiquiti Inc ENVR 5.1.12
  • Ubiquiti Inc ENVR-Core 5.1.12
  • Ubiquiti Inc UNAS-2 5.1.10
  • Ubiquiti Inc UNAS-4 5.1.10
  • Ubiquiti Inc UNAS-Pro 5.1.10
  • Ubiquiti Inc UNAS-Pro-4 5.1.10
  • Ubiquiti Inc UNAS-Pro-8 5.1.10
  • Ubiquiti Inc UCKP 5.1.12
  • Ubiquiti Inc UCK 5.1.12
  • Ubiquiti Inc UCK-Enterprise 5.1.12
  • Ubiquiti Inc UCG-Ultra 5.1.12
  • Ubiquiti Inc UCG-Max 5.1.12
  • Ubiquiti Inc UCG-Fiber 5.1.12

Is CVE-2026-34910 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Timeline

  1. CISA SSVC: exploitation active
  2. Published
  3. Added to CISA KEV
  4. CISA patch deadline

Known exploited

Added
4mo ago
Patch by
2026-06-26 (4mo ago)
Ransomware
Not known
Required action
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Vendor, product
Ubiquiti, UniFi OS
CISA name
Ubiquiti UniFi OS Improper Input Validation Vulnerability

CISA SSVC

Exploitation
Active, exploited in the wild
Automatable
yes
Technical impact
total
Assessed
5mo ago

Exploit prediction

90.03% chance of exploitation in the next 30 days, higher than 99.7% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • Nuclei template UniFi OS Server - Command Injection nuclei detection template
  • pwndefend.com https://www.pwndefend.com/2026/06/09/cve-2026-34910-exploitation-itw-building-a-botnet-mirai/ referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 10.0 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Affected products

  • Ubiquiti Inc UniFi OS Server
  • Ubiquiti Inc UDM
  • Ubiquiti Inc UDM-Pro
  • Ubiquiti Inc UDM-SE
  • Ubiquiti Inc UDM-Pro-Max
  • Ubiquiti Inc UDM-Beast
  • Ubiquiti Inc EFG
  • Ubiquiti Inc UDW
  • Ubiquiti Inc UDR
  • Ubiquiti Inc UDR7
  • Ubiquiti Inc UDR-5G
  • Ubiquiti Inc Express 7
  • Ubiquiti Inc UNVR
  • Ubiquiti Inc UNVR-Pro
  • Ubiquiti Inc UNVR-Instant
  • Ubiquiti Inc UNVR-G2
  • Ubiquiti Inc UNVR-G2-Pro
  • Ubiquiti Inc ENVR
  • Ubiquiti Inc ENVR-Core
  • Ubiquiti Inc UNAS-2
  • Ubiquiti Inc UNAS-4
  • Ubiquiti Inc UNAS-Pro
  • Ubiquiti Inc UNAS-Pro-4
  • Ubiquiti Inc UNAS-Pro-8
  • Ubiquiti Inc UCKP
  • Ubiquiti Inc UCK
  • Ubiquiti Inc UCK-Enterprise
  • Ubiquiti Inc UCG-Ultra
  • Ubiquiti Inc UCG-Max
  • Ubiquiti Inc UCG-Fiber
  • Ubiquiti Inc UCG-Industrial

Classification

Weakness
  • CWE-20 Improper Input Validation

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.