KEV Intelligence

Vulnerability report

Active exploitation observed Confirmed confidence In CISA KEV

CVE-2026-34910

UniFi OS Server Command Injection

Ubiquiti Inc / UniFi OS Server · affected before 5.0.8

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Severity
CVSS 10.0 · Critical
Confidence
Confirmed
Exploit status
Observed in sensors
EPSS
87.0%
First observed
11 Jun 2026
Last observed
17 Aug 2026

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2026-34910 is an unauthenticated vulnerability affecting Ubiquiti Inc UniFi OS Server and 30 other products. A malicious actor with access to the network could exploit an Improper Input Validation vulnerability...

Is it exploited?

Yes. KEV Intelligence sensors observed exploitation attempts with confirmed confidence.

Who is affected?

Ubiquiti Inc / UniFi OS Server affected before 5.0.8.

What should we do?

Patch immediately, validate internet-facing exposure, and monitor for matching requests.

Overview

UniFi OS Server Command Injection

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.

Vendor Product Affected Status
Ubiquiti Inc UniFi OS Server Before 5.0.8 Affected
Ubiquiti Inc UDM Before 5.1.12 Affected
Ubiquiti Inc UDM-Pro Before 5.1.12 Affected
Ubiquiti Inc UDM-SE Before 5.1.12 Affected
Ubiquiti Inc UDM-Pro-Max Before 5.1.12 Affected
Ubiquiti Inc UDM-Beast Before 5.1.11 Affected
Ubiquiti Inc EFG Before 5.1.12 Affected
Ubiquiti Inc UDW Before 5.1.12 Affected
Ubiquiti Inc UDR Before 5.1.12 Affected
Ubiquiti Inc UDR7 Before 5.1.12 Affected
Ubiquiti Inc UDR-5G Before 5.1.12 Affected
Ubiquiti Inc Express 7 Before 5.1.12 Affected
Ubiquiti Inc UNVR Before 5.1.12 Affected
Ubiquiti Inc UNVR-Pro Before 5.1.12 Affected
Ubiquiti Inc UNVR-Instant Before 5.1.12 Affected
Ubiquiti Inc UNVR-G2 Before 5.1.12 Affected
Ubiquiti Inc UNVR-G2-Pro Before 5.1.12 Affected
Ubiquiti Inc ENVR Before 5.1.12 Affected
Ubiquiti Inc ENVR-Core Before 5.1.12 Affected
Ubiquiti Inc UNAS-2 Before 5.1.10 Affected
Ubiquiti Inc UNAS-4 Before 5.1.10 Affected
Ubiquiti Inc UNAS-Pro Before 5.1.10 Affected
Ubiquiti Inc UNAS-Pro-4 Before 5.1.10 Affected
Ubiquiti Inc UNAS-Pro-8 Before 5.1.10 Affected
Ubiquiti Inc UCKP Before 5.1.12 Affected
Published
22 May 2026
Exploitation Reported
09 Jun 2026
Attack vector
Remote
Complexity
Low
Privileges
None
User interaction
None

Tags

nuclei_scanner cisa

CVE References

Exploitation evidence

Why KEV Intelligence marks this CVE as exploited

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploited in the wild

Defused Cyber

Recorded 09 Jun 2026

Independent exploitation attestation added to the KEV Intelligence record.

Active exploitation observed

KEV Intelligence sensor

First observed 11 Jun 2026

First-party sensor telemetry confirms matching exploitation attempts.

Proof of concept available

Nuclei Templates

Recorded 12 Jun 2026

Public scanner or PoC coverage increases practical exploitability.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the KEV Intelligence Pro API.

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Source Added
Defused Cyber First 2026-06-09 08:18 UTC
KEV Intelligence 2026-06-11 12:15 UTC
CISA 2026-06-23 00:00 UTC
CVE 2026-06-23 18:11 UTC
All CISA Advisories 2026-06-23 18:20 UTC
The Shadowserver 2026-07-08 00:00 UTC

Operational indicators for this CVE are listed under Detection.

Sensor telemetry

First-party evidence of exploitation activity

Aggregate observations show the scale, recency, and distribution of activity without overstating sparse data.

9

Attempts observed

5

Unique attacker IPs

3

Attacker countries

JP · NL · US

4

Sensors observed

Exploitation attempts over the last 71 days

Daily events observed by KEV Intelligence sensors

Updated 19 Aug 2026

0
1
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0
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0
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0
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0
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2
1
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0
14
0
0
0
0
0
0
0
0
0
0
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10 Jun 25 Jun 10 Jul 25 Jul 19 Aug

First observed 11 Jun 2026 · Last observed 17 Aug 2026

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Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Observed signals

Request targets
8
User-Agents
8

Raw values available in Pro and Enterprise.

Virtual patch status

KEV Intelligence virtual patch guidance is available for this CVE.

AWS WAF Cloudflare ModSecurity

Attacker IP Indicators

Attacker IP indicators observed · available in Pro and Enterprise.

Sensor-derived attacker IP indicators are available to Pro and Enterprise accounts under Detection and through the Pro API.

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Scanner Artifacts

Scanner and exploit-framework references linked to this CVE.

Scanner Reference Detected
Nuclei https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-34910.yaml 10 Jun 2026

Virtual Patch Detail

Compensating WAF rules for this CVE.

Available

Enterprise feature. Virtual patch rule content and deployable vendor exports (ModSecurity, Cloudflare, AWS WAF) are available to KEV Intelligence Enterprise users.

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Risk and context

Severity, weaknesses, and research context

CVSS v3.1

10.0 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

EPSS

87.0%

Weaknesses

Improper Input Validation CWE-20

Recent mention · All CISA Advisories

CISA Adds Four Known Exploited Vulnerabilities to Catalog

CISA has added four new vulnerabilities to its Known Exploited Vulnerabilities (KEV) Catalog, based on evidence of active exploitation.   CVE-2025-67038 Lantronix EDS5000 Code Injection Vulnerability CVE-2026-34908 Ubiquiti UniFi OS Improper Access Control...

Read full advisory

Potential Proof of Concepts

These PoCs are unverified and could contain malware. Use at your own risk.

Boreas37/CVE-2026-34910-PoC

github · Created 2026-08-09 16:58:00 UTC · 2 stars · AI assessment 90%

CVE-2026-34910/34909 — UniFi OS unauth RCE + file read via ..%2f auth bypass (CVSS 10.0, KEV, Mirai ITW)

UniFi OS Server - Command Injection

nuclei · Created Unknown

Timeline

From disclosure to observed exploitation

  1. KEV confirmed by The Shadowserver

    Exploitation attested by an external source

  2. KEV confirmed by All CISA Advisories

    Exploitation attested by an external source

  3. KEV confirmed by CVE

    Exploitation attested by an external source

  4. Added to CISA KEV

    Listed in the CISA Known Exploited Vulnerabilities catalog

  5. Virtual patch available

    Compensating WAF rule available to block exploitation

  6. Public PoC available

    Public proof-of-concept code published

  7. Observed by KEV Intelligence sensors

    Evidence-backed exploitation signal

  8. Indicators of compromise added (10)

    Indicators of compromise recorded

  9. Nuclei template available

    Scanner coverage available

  10. Added to KEV Intelligence KEV Feed

    High-confidence, third-party attested exploitation

  11. CVE published

    Vulnerability disclosed publicly

  12. CVE ID reserved

    Identifier reserved by the CNA

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

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  • Evidence confidence and provenance
  • First-party sensor telemetry
  • PoC and scanner references
  • Affected versions and enrichment
  • Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2026-34910

Free JSON includes basic KEV fields 
{
  "cve_id": "CVE-2026-34910",
  "confidence": "Confirmed",
  "cvss_score": 10.0,
  "cvss_estimated": false,
  "epss_score": 0.86958,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": true
  },
  "sensor_telemetry": { "attempts": 9, "sensors": 4 }
}

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