Risk Letters

Exploited vulnerability

CVE-2026-34910

TLP:CLEAR

Ubiquiti UniFi OS Improper Input Validation Vulnerability

Ubiquiti UniFi OS contains an improper input validation vulnerability which could allow a malicious actor with access to the network to conduct command injection.

Facts

  • Vendor: Ubiquiti
  • Product: UniFi OS
  • CVSS: 10
  • EPSS (probability of exploitation within 30 days): 90 %
  • On CISA's Known Exploited Vulnerabilities list since: 23 June 2026
  • First known exploitation: 23 June 2026
  • CISA's deadline for US federal agencies: 26 June 2026
  • Weakness: CWE-20
  • First seen by Risk Letters: 22 May 2026

Members see which Nordic sectors the flaw hits, and what to do about it.

Get the full brief

Data: NVD (public domain), CISA KEV, FIRST EPSS, MITRE ATT&CK, AlienVault OTX. NVD