CVE-2026-34908 Ubiquiti UniFi OS: login or permission bypass
In plain words: A door that should be locked is not: part of the system can be reached without a valid login or permission. The attacker gets in as a user or administrator without knowing a password.
Confirmed exploited by CISA on · US federal patch deadline Jun 26, 2026
What to do
- Install Ubiquiti's security update for UniFi OS. If no update exists, follow the vendor's workaround or stop using the product until one ships.
- Turn on automatic firmware updates and replace gear the maker no longer supports.
- Change default passwords and switch off remote administration and features you do not use.
- Do not put storage boxes or cameras directly on the internet — use the maker's app or a VPN.
Who is affected
Could reach you. This one is aimed at devices or apps of the kind people own.
What's at risk: Taken over in bulk to join botnets, used to watch your traffic, or — for storage boxes — locked by ransomware.
The details
- Official name
- Ubiquiti UniFi OS Improper Access Control Vulnerability
- Product
- Ubiquiti UniFi OS
- CISA description
- 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.
- Type of flaw
- Login or permission bypass (CWE-284)
- Confirmed exploited
- Jun 23, 2026
- US federal patch deadline
- Jun 26, 2026
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Answering about CVE-2026-34908 ·
Questions about CVE-2026-34908
Is CVE-2026-34908 being exploited?
Yes. CISA added CVE-2026-34908 to its Known Exploited Vulnerabilities catalog on Jun 23, 2026, which means there is reliable evidence of real-world attacks.
How do I fix CVE-2026-34908?
Install Ubiquiti's security update for UniFi OS. If no update exists, follow the vendor's workaround or stop using the product until one ships. Turn on automatic firmware updates and replace gear the maker no longer supports.
Am I affected by CVE-2026-34908?
Only if you use Ubiquiti UniFi OS. This one is aimed at devices or apps of the kind people own.