Vulnerability details
CVE-2026-34909
Actively exploited
Ubiquiti EFGUbiquiti ENVRUbiquiti ENVR-CoreUbiquiti ExpressUbiquiti Express 7Ubiquiti UCG-Fiber
CVSS 3.1
10.0Critical
Official description
A malicious actor with access to the network could exploit a Path Traversal vulnerability found in UniFi OS devices to access files on the underlying system that could be manipulated to access an underlying account.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 10.0Critical | 3.1 | CVEProject cvelistV5 (CNA) (hackerone) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| Ubiquiti Inc | EFG | v < 5.1.12 | CVEProject cvelistV5 (CNA) |
| Ubiquiti Inc | ENVR | v < 5.1.12 | CVEProject cvelistV5 (CNA) |
| Ubiquiti Inc | ENVR-Core | v < 5.1.12 | CVEProject cvelistV5 (CNA) |
| Ubiquiti Inc | Express | v < 4.0.14 | CVEProject cvelistV5 (CNA) |
| Ubiquiti Inc | Express 7 | v < 5.1.12 | CVEProject cvelistV5 (CNA) |
| Ubiquiti Inc | UCG-Fiber | v < 5.1.12 | CVEProject cvelistV5 (CNA) |
| Ubiquiti Inc | UCG-Industrial | v < 5.1.12 | CVEProject cvelistV5 (CNA) |
| Ubiquiti Inc | UCG-Max | v < 5.1.12 | CVEProject cvelistV5 (CNA) |
| Ubiquiti Inc | UCG-Ultra | v < 5.1.12 | CVEProject cvelistV5 (CNA) |
| Ubiquiti Inc | UCK | v < 5.1.12 | CVEProject cvelistV5 (CNA) |
| Ubiquiti Inc | UCK-Enterprise | v < 5.1.12 | CVEProject cvelistV5 (CNA) |
| Ubiquiti Inc | UCKP | v < 5.1.12 | CVEProject cvelistV5 (CNA) |
| Ubiquiti Inc | UDM | v < 5.1.12 | CVEProject cvelistV5 (CNA) |
| Ubiquiti Inc | UDM-Beast | v < 5.1.11 | CVEProject cvelistV5 (CNA) |
| Ubiquiti Inc | UDM-Pro | v < 5.1.12 | CVEProject cvelistV5 (CNA) |
| Ubiquiti Inc | UDM-Pro-Max | v < 5.1.12 | CVEProject cvelistV5 (CNA) |
| Ubiquiti Inc | UDM-SE | v < 5.1.12 | CVEProject cvelistV5 (CNA) |
| Ubiquiti Inc | UDR | v < 5.1.12 | CVEProject cvelistV5 (CNA) |
| Ubiquiti Inc | UDR-5G | v < 5.1.12 | CVEProject cvelistV5 (CNA) |
| Ubiquiti Inc | UDR7 | v < 5.1.12 | CVEProject cvelistV5 (CNA) |
| Ubiquiti Inc | UDW | v < 5.1.12 | CVEProject cvelistV5 (CNA) |
| Ubiquiti Inc | UNAS-2 | v < 5.1.10 | CVEProject cvelistV5 (CNA) |
| Ubiquiti Inc | UNAS-4 | v < 5.1.10 | CVEProject cvelistV5 (CNA) |
| Ubiquiti Inc | UNAS-Pro | v < 5.1.10 | CVEProject cvelistV5 (CNA) |
| Ubiquiti Inc | UNAS-Pro-4 | v < 5.1.10 | CVEProject cvelistV5 (CNA) |
| Ubiquiti Inc | UNAS-Pro-8 | v < 5.1.10 | CVEProject cvelistV5 (CNA) |
| Ubiquiti Inc | UNVR | v < 5.1.12 | CVEProject cvelistV5 (CNA) |
| Ubiquiti Inc | UNVR-G2 | v < 5.1.12 | CVEProject cvelistV5 (CNA) |
| Ubiquiti Inc | UNVR-G2-Pro | v < 5.1.12 | CVEProject cvelistV5 (CNA) |
| Ubiquiti Inc | UNVR-Instant | v < 5.1.12 | CVEProject cvelistV5 (CNA) |
| Ubiquiti Inc | UNVR-Pro | v < 5.1.12 | CVEProject cvelistV5 (CNA) |
| Ubiquiti Inc | UniFi OS Server | v < 5.0.8 | CVEProject cvelistV5 (CNA) |
References and advisories
3- https://community.ui.com/releases/Security-Advisory-Bulletin-064-064/84811c09-4cf4-42ab-bd61-cc994445963b
- https://www.pwndefend.com/2026/06/09/cve-2026-34910-exploitation-itw-building-a-botnet-mirai/ third-party-advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-34909 government-resource
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Details
- Published
- 2026-05-22
- Last updated
- 2026-06-24
- State
- Published
- Assigner (CNA)
- hackerone
- Kolun priority
- 80 · High
CISA KEV catalog
- Date added
- 2026-06-23
- Due date
- 2026-06-26
- Used in ransomware
- Unknown
Exploit prediction (EPSS)
69.23%
Probability of exploitation in 30 days
99.3%
Percentile (among all CVEs)
- 2026-11-0469.23%
- 2026-11-0368.03%
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- Active
- Technical impact
- Total
Weaknesses (CWE)
- CWE-22Path Traversal