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CVE-2026-34911

7.7 · HIGH

A malicious actor with access to the network and low privileges could exploit a Path Traversal vulnerability found in UniFi OS devices to access files on the underlying system that could be manipul…

Published May 22, 2026uiCWE-22EPSS 0.68%

Overview

CVE-2026-34911 is a high-severity vulnerability affecting ui unifi_os_server. It was published on May 22, 2026 and has a CVSS 3.1 base score of 7.7 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.7, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

A malicious actor with access to the network and low privileges could exploit a Path Traversal vulnerability found in UniFi OS devices to access files on the underlying system that could be manipulated to obtain sensitive information.

Remediation

Check the references section for vendor advisories and patches from ui. Update unifi_os_server to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus
uiunifi_os_server>= 0, < 5.0.8Affected
uiunifi_cloud_gateway_industrial_firmware>= 0, < 5.1.12Affected
uiunifi_dream_machine_firmware>= 0, < 5.1.12Affected
uiunifi_dream_machine_pro_firmware>= 0, < 5.1.12Affected
uiunifi_dream_machine_special_edition_firmware>= 0, < 5.1.12Affected
uiunifi_dream_machine_pro_max_firmware>= 0, < 5.1.12Affected
uienterprise_fortress_gateway_firmware>= 0, < 5.1.12Affected
uiunifi_dream_wall_firmware>= 0, < 5.1.12Affected
uiunifi_dream_router_firmware>= 0, < 5.1.12Affected
uiunifi_dream_router_7_firmware>= 0, < 5.1.12Affected
uiunifi_express_7_firmware>= 0, < 5.1.12Affected

References

Refcommunity.ui.com/releases/Security-Advisory-Bulletin-064-064/84811c09-4cf4-42ab-bd61-cc994445963b

How CyberStrike helps

Frequently asked questions

What is CVE-2026-34911?

CVE-2026-34911 is a high-severity vulnerability affecting ui unifi_os_server. It was published on May 22, 2026 and has a CVSS 3.1 base score of 7.7 (HIGH).

How severe is CVE-2026-34911?

This vulnerability has a CVSS 3.1 base score of 7.7, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-34911?

Check the references section for vendor advisories and patches from ui. Update unifi_os_server to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-34911?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-34911 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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