Threat Intelligence / CVE / CVE-2026-34911

CVE-2026-34911 — Ubiquiti Inc UniFi OS Server

CVSS v3.1 7.7 (HIGH) · EPSS 0.0% (higher than 1.4% of all scored CVEs) · Priority 3.9/10 · Published 2026-05-22

As of 2026-05-22, CVE-2026-34911 is a HIGH-severity vulnerability in Ubiquiti Inc UniFi OS Server, CVSS v3.1 7.7, EPSS 0.0% (1.4th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-34911, most recently “Ubiquiti UniFi OS — Three Max-Severity Pre-Auth Vulnerabilities (CVE-2026-34908 / 34909 / 34910) in Security Advisory Bulletin 064”.

Last updated: 2026-05-22

What is CVE-2026-34911?

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.

The record classifies CVE-2026-34911 under weakness class CWE-22. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs low-privilege credentials, needs no user interaction, and has high impact on confidentiality. 10 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 113 days ago.

Severity and exploitation probability

CVSS v3.1 base score: 7.7 — HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
EPSS (FIRST): 0.0% probability of exploitation in the next 30 days, higher than 1.4% of all scored CVEs
CISA KEV: Not listed in the CISA Known Exploited Vulnerabilities catalog
Threadlinqs priority: 3.9/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
Published: 2026-05-22

Is CVE-2026-34911 being exploited?

It currently carries a trending score of 7 in the Threadlinqs vulnerability feed.

Affected products and versions

Ubiquiti Inc: UniFi OS Server, UDM, UDM-Pro, UDM-SE, UDM-Pro-Max, UDM-Beast, EFG, UDW, UDR, UDR7

How to fix CVE-2026-34911

No vendor patch reference has been recorded for CVE-2026-34911 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

Threat activity tracking CVE-2026-34911

1 tracked threat in the Threadlinqs corpus references CVE-2026-34911, either in the campaign’s CVE list or as an indicator on the campaign record.

Ubiquiti UniFi OS — Three Max-Severity Pre-Auth Vulnerabilities (CVE-2026-34908 / 34909 / 34910) in Security Advisory Bulletin 064 — CRITICAL · 2026-05-22

Sources

Seeded from cveorg and not yet processed by the Threadlinqs enrichment pipeline, so blank CVSS, EPSS or KEV fields above mean NOT MEASURED rather than measured-absent.

community.ui.com

Full detection coverage & IOCs for threats exploiting CVE-2026-34911 are available via the Threadlinqs MCP server (Purple tier). View plans →

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