What’s Vulnerable › Vulnerabilities

CVE-2026-55110

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-02 · updated 2026-07-09
• Weakness: CWE-942

Description

A malicious actor who lures an authenticated user to a malicious page could exploit a Cross-Origin Resource Sharing (CORS) misconfiguration found in UniFi OS to trigger actions in UniFi OS using that user's session.

Affected products

• Ui Enterprise Firewall Core Firmware: through 5.1.18
• Ui Enterprise Fortress Gateway Firmware: through 5.1.15
• Ui Enterprise Network Video Recorder Core Firmware: through 5.1.15
• Ui Enterprise Network Video Recorder Firmware: through 5.1.15
• Ui Unas 2 Firmware: through 5.1.16
• Ui Unas 4 Firmware: through 5.1.16
• Ui Unas Pro 4 Firmware: through 5.1.16
• Ui Unas Pro 8 Firmware: through 5.1.16
• Ui Unas Pro Firmware: through 5.1.16
• Ui Unifi Cloud Gateway Fiber Firmware: through 5.1.15
• Ui Unifi Cloud Gateway Industrial Firmware: through 5.1.15
• Ui Unifi Cloud Gateway Max Firmware: through 5.1.15
• Ui Unifi Cloud Gateway Ultra Firmware: through 5.1.15
• Ui Unifi Cloud Key Plus Firmware: through 5.1.15
• Ui Unifi Cloudkey Enterprise Firmware: through 5.1.15
• Ui Unifi Cloudkey Firmware: through 5.1.15
• Ui Unifi Dream Machine Beast Firmware: through 5.1.15
• Ui Unifi Dream Machine Pro Firmware: through 5.1.15
• Ui Unifi Dream Machine Pro Max Firmware: through 5.1.15
• Ui Unifi Dream Machine Special Edition Firmware: through 5.1.15
• Ui Unifi Dream Router 7 Firmware: through 5.1.15
• Ui Unifi Dream Router Firmware: through 5.1.15
• Ui Unifi Dream Wall Firmware: through 5.1.15
• Ui Unifi Express 7 Firmware: through 5.1.15
• Ui Unifi Network Video Recorder Firmware: through 5.1.15
• Ui Unifi Network Video Recorder G2 Firmware: through 5.1.15
• Ui Unifi Network Video Recorder G2 Pro Firmware: through 5.1.15
• Ui Unifi Network Video Recorder Instant Firmware: through 5.1.15
• Ui Unifi Network Video Recorder Pro Firmware: through 5.1.15
• Ubiquiti Inc UniFi OS Server: through 5.1.15

References

• https://community.ui.com/releases/Security-Advisory-Bulletin-066-066/984eceb3-49c8-4227-942d-671c289b3afc

Get alerted when CVE-2026-55110 or the next vulnerability affects your stack