CVE entry · CVE-2026-34909
CVE-2026-34909: Ubiquiti UniFi OS Path Traversal Vulnerability
Ubiquiti UniFi OS contains a path traversal vulnerability which could allow a malicious actor with access to the network to access files on the underlying system that could be manipulated to access an underlying account.
- Actively exploited: added to CISA’s KEV catalog on June 23, 2026.
- Use by ransomware: not established so far.
- Remediation deadline for US federal agencies: June 26, 2026.
Description from CISA’s KEV catalog.
What to do
- Check whether your estate includes Ubiquiti UniFi OS, including internet-facing devices.
- Apply the vendor’s patch or mitigations (references below). Failing that, isolate the product or stop using it, as CISA requires of US federal agencies.
- An exploited vulnerability has often been used before it was fixed: look for signs of compromise, especially on internet-facing devices.
References
- Vendor advisory or reference cited by CISA (community.ui.com)
- NVD entry (NIST)
- CISA KEV catalog