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CVE-2026-34910.

Severity, exploit probability and exploitation status for one vulnerability, drawn from NVD, FIRST EPSS and CISA's exploited catalogue.

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known exploited Ubiquiti UniFi OS Improper Input Validation Vulnerability

Vendor / product
Ubiquiti - UniFi OS
Listed by CISA
2026-06-23
Federal fix deadline
2026-06-26 (passed)
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.

Scores

CVSS 3.1
10.0 critical CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
EPSS
87% estimated probability of exploitation in the next 30 days (higher than 100% of all CVEs)
Weakness class
CWE-20

ATT&CK techniques

inferred from weakness class no curated mapping exists for this CVE; these are the techniques typically seen with CWE-20 vulnerabilities

ReconnaissanceResource DevelopmentInitial AccessExecutionPersistencePrivilege EscalationStealthDefense ImpairmentCredential AccessDiscoveryLateral MovementCollectionCommand and ControlExfiltrationImpact

T1190 Exploit Public-Facing Application

Initial Access

Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.

Inferred from CWE-20.

T1059 Command and Scripting Interpreter

Execution

Adversaries may abuse command and script interpreters to execute commands, scripts, or binaries.

Inferred from CWE-20.

T1068 Exploitation for Privilege Escalation

Privilege Escalation

Adversaries may exploit software vulnerabilities in an attempt to elevate privileges.

Inferred from CWE-20.

T1027 Obfuscated Files or Information

Stealth

Adversaries may attempt to make an executable or file difficult to discover or analyze by encrypting, encoding, or otherwise obfuscating its contents on the system or in transit.

Inferred from CWE-20.

T1036 Masquerading

Stealth

Adversaries may attempt to manipulate features of their artifacts to make them appear legitimate or benign to users and/or security tools.

via sub-technique T1036.001 Invalid Code Signature

Inferred from CWE-20.

T1553 Subvert Trust Controls

Defense Impairment

Adversaries may undermine security controls that will either warn users of untrusted activity or prevent execution of untrusted programs.

via sub-technique T1553.002 Code Signing

Inferred from CWE-20.

T1539 Steal Web Session Cookie

Credential Access

An adversary may steal web application or service session cookies and use them to gain access to web applications or Internet services as an authenticated user without needing credentials.

Inferred from CWE-20.

T1005 Data from Local System

Collection

Adversaries may search local system sources, such as file systems, configuration files, local databases, virtual machine files, or process memory, to find files of interest and sensitive data prior to Exfiltration.

Inferred from CWE-20.

See these techniques on the full ATT&CK matrix.

Description

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.

Published
2026-05-22
Last modified
2026-07-23
NVD status
Analyzed

References

CVSS measures how bad exploitation would be; EPSS estimates how likely exploitation is within 30 days; the CISA listing means it is already happening. Read them together: a CVSS 9.8 with EPSS 0.04% is usually less urgent than a CVSS 7.2 on the exploited list. Data: NVD, FIRST EPSS, CISA KEV; detail is cached for a week, scores for a day. ATT&CK techniques come from the CTID KEV mappings project where a curated mapping exists, otherwise they are inferred from the weakness class and labelled as such. ATT&CK is a registered trademark of The MITRE Corporation. © 2026 The MITRE Corporation. This work is reproduced and distributed with the permission of The MITRE Corporation.