PatchTheCVECVE-2026-55116: A malicious actor with access to the network and under certain network configurations could exploit an Imprope
CVE-2026-55116 is a critical-severity flaw (CVSS 9.0) affecting unifi connect. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
A malicious actor with access to the network and under certain network configurations could exploit an Improper Access Control vulnerability found in certain devices running UniFi OS to make unauthorized changes to such UniFi OS devices.
Why this priority
- Critical severity
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 9.0 (Critical) |
| Attack vector | Network (remote) |
| Attack complexity | High |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.4% (top 65%) |
| CISA exploited list | No |
| Weakness | CWE-284 |
| Published | 2026-07-02 |
| Last modified | 2026-07-09 |
Last updated 2026-07-09 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2026-55116?
unifi connect: upgrade to 3.4.20. Exact commands for each OS are on this page.
Is CVE-2026-55116 being exploited?
CVE-2026-55116 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2026-55116 affect?
CVE-2026-55116 affects unifi connect. Severity is critical (CVSS 9.0). A malicious actor with access to the network and under certain network configurations could exploit an Improper Access Control vulnerability found in certain devices running UniFi OS to make unauthorized changes to such UniFi OS devices.
How urgent is CVE-2026-55116?
Priority 45/100. Critical severity; Remotely exploitable, no login, no user action