CVE•Published 2026-05-22•Modified 2026-07-23•2 articles on news•6 live references•NVD data
CVE-2026-34909Ui · Unifi_os_server
Vulnerability data via NVD (ingested)
CVSS v3.1
10.0
CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
EPSS percentile
81
Exploit Prediction Scoring System · top 19% of all CVEs
Weaknesses (CWE)
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.
Timeline
Published 2026-05-22
Modified 2026-07-23
External references
Search for exposed instances
Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).
Shodan · vuln tag0 hosts
vuln:CVE-2026-34909Hosts Shodan has explicitly fingerprinted as vulnerable.
Shodan · product
product:"Ui Unifi Os Server"All exposed Ui Unifi Os Server instances — cross-reference with the CVE's affected-version range.
Shodan · banner/body mention
http.html:"Unifi Os Server"HTTP body or banner mentions "Unifi Os Server" — catches deploys Shodan didn't identify as a product.
More intel sources (5)
Shodan report
vuln:CVE-2026-34909Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2026-34909Censys host search filtered to this CVE id.
grep.app
CVE-2026-34909Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2026-34909GitHub code search for direct mentions.
Google dork
"CVE-2026-34909" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.
Known PoCs on GitHub (6)
CVE-2026-349096 repos
Ostorlab/KEVunknown
Ostorlab KEV: One-command to detect most remotely known exploitable vulnerabilities. Sourced from CISA KEV, Google's Tsunami, Ostorlab's Asteroid and Bug Bounty programs.
BishopFox/CVE-2026-34908-checkPython
Safely detect whether a UniFi OS Server is vulnerable to CVE-2026-34908
opendr-io/causalityJupyter Notebook
The difference between exploitation prediction and detection is akin to the difference between detecting a missile launch or a detonation. Every avoided exploitation cycle saves hu…
Boreas37/CVE-2026-34910-PoCPython
CVE-2026-34910/34909 — UniFi OS unauth RCE + file read via ..%2f auth bypass (CVSS 10.0, KEV, Mirai ITW)
barmi/cve-patch-auditorGo
Audit CVE impact, patch status, remediation progress, and verification results across systems.
Dragon-Lady/linux-supply-chain-guardJavaScript
Read-only Linux host checker for supply-chain incident response, including vulnerable kernel posture, risky module state, and known developer-tooling persistence indicators