What’s Vulnerable › Vulnerabilities

CVE-2026-34909: Ubiquiti UniFi OS Path Traversal Vulnerability

• Severity: critical (CVSS 10.0 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2026-06-23
• EPSS: 68.0% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-05-22 · updated 2026-07-23
• Weakness: CWE-22

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.

Affected products

• Ui Enterprise Fortress Gateway Firmware: before 5.1.12 — fixed in 5.1.12
• Ui Enterprise Network Video Recorder Core Firmware: before 5.1.12 — fixed in 5.1.12
• Ui Enterprise Network Video Recorder Firmware: before 5.1.12 — fixed in 5.1.12
• Ui Unas 2 Firmware: before 5.1.10 — fixed in 5.1.10
• Ui Unas 4 Firmware: before 5.1.10 — fixed in 5.1.10
• Ui Unas Pro 4 Firmware: before 5.1.10 — fixed in 5.1.10
• Ui Unas Pro 8 Firmware: before 5.1.10 — fixed in 5.1.10
• Ui Unas Pro Firmware: before 5.1.10 — fixed in 5.1.10
• Ui Unifi Cloud Gateway Fiber Firmware: before 5.1.12 — fixed in 5.1.12
• Ui Unifi Cloud Gateway Industrial Firmware: before 5.1.12 — fixed in 5.1.12
• Ui Unifi Cloud Gateway Max Firmware: before 5.1.12 — fixed in 5.1.12
• Ui Unifi Cloud Gateway Ultra Firmware: before 5.1.12 — fixed in 5.1.12
• Ui Unifi Cloud Key Plus Firmware: before 5.1.12 — fixed in 5.1.12
• Ui Unifi Cloudkey Enterprise Firmware: before 5.1.12 — fixed in 5.1.12
• Ui Unifi Cloudkey Firmware: before 5.1.12 — fixed in 5.1.12
• Ui Unifi Dream Machine Beast Firmware: before 5.1.11 — fixed in 5.1.11
• Ui Unifi Dream Machine Firmware: before 5.1.12 — fixed in 5.1.12
• Ui Unifi Dream Machine Pro Firmware: before 5.1.12 — fixed in 5.1.12
• Ui Unifi Dream Machine Pro Max Firmware: before 5.1.12 — fixed in 5.1.12
• Ui Unifi Dream Machine Special Edition Firmware: before 5.1.12 — fixed in 5.1.12
• Ui Unifi Dream Router 5G Max Firmware: before 5.1.12 — fixed in 5.1.12
• Ui Unifi Dream Router 7 Firmware: before 5.1.12 — fixed in 5.1.12
• Ui Unifi Dream Router Firmware: before 5.1.12 — fixed in 5.1.12
• Ui Unifi Dream Wall Firmware: before 5.1.12 — fixed in 5.1.12
• Ui Unifi Express 7 Firmware: before 5.1.12 — fixed in 5.1.12
• Ui Unifi Express Firmware: before 4.0.14 — fixed in 4.0.14
• Ui Unifi Network Video Recorder Firmware: before 5.1.12 — fixed in 5.1.12
• Ui Unifi Network Video Recorder G2 Firmware: before 5.1.12 — fixed in 5.1.12
• Ui Unifi Network Video Recorder G2 Pro Firmware: before 5.1.12 — fixed in 5.1.12
• Ui Unifi Network Video Recorder Instant Firmware: before 5.1.12 — fixed in 5.1.12

How to fix

Upgrade to a fixed version: Ui Enterprise Fortress Gateway Firmware 5.1.12; Ui Enterprise Network Video Recorder Core Firmware 5.1.12; Ui Enterprise Network Video Recorder Firmware 5.1.12; Ui Unas 2 Firmware 5.1.10; Ui Unas 4 Firmware 5.1.10; Ui Unas Pro 4 Firmware 5.1.10; Ui Unas Pro 8 Firmware 5.1.10; Ui Unas Pro Firmware 5.1.10; Ui Unifi Cloud Gateway Fiber Firmware 5.1.12; Ui Unifi Cloud Gateway Industrial Firmware 5.1.12; Ui Unifi Cloud Gateway Max Firmware 5.1.12; Ui Unifi Cloud Gateway Ultra Firmware 5.1.12. Check the vendor advisory for mitigations.

References

• https://community.ui.com/releases/Security-Advisory-Bulletin-064-064/84811c09-4cf4-42ab-bd61-cc994445963b
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-34909
• https://www.pwndefend.com/2026/06/09/cve-2026-34910-exploitation-itw-building-a-botnet-mirai/

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