CVE-2026-34908 — Ubiquiti UniFi OS Improper Access Control Vulnerability

CVE-2026-34908 (Ubiquiti UniFi OS) is in the CISA Known Exploited Vulnerabilities catalog since 2026-06-23. Ubiquiti UniFi OS contains an improper access control vulnerability which could allow a malicious actor with… See the required fix, due date and advisories.

Exploitation status

CVE-2026-34908 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 2026-06-23. Ubiquiti UniFi OS contains an improper access control vulnerability which could allow a malicious actor with access to the network to make unauthorized changes to the system.

Advisory facts

Vendor or project
Ubiquiti
Affected product
UniFi OS
Added to CISA KEV
2026-06-23
US federal remediation due date
2026-06-26
Ransomware association
Unknown
EPSS score
2.5% chance of exploitation in 30 days
Weakness (CWE)
CWE-284

Remediation: the 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.

Wording published by CISA for this catalog entry. It is the baseline action, not a decision about your environment: whether this exposure matters for you depends on where the affected component runs, what it is exposed to and who owns it.

From advisory to a decision you can defend

A catalog entry tells you a vulnerability is being exploited somewhere. It does not tell you whether it matters in your estate, who owns the fix, or what evidence an auditor will ask for later. That is the work VulnTrek does: it takes findings from the tools you already run, decides which exposure actually matters, routes it to an owner, keeps remediation human-approved and retains the lineage as evidence.

Sourced from public upstream advisories (CISA KEV, ENISA EUVD, vendor PSIRTs) mirrored daily. Informational only — not a remediation decision, not legal advice, and the absence of a record is not evidence of safety.