Ubiquiti UniFi Connect unauthenticated command-injection RCE (CVSS 10.0), SAB-066

Ubiquiti UniFi SAB-066 — 25 vulnerabilities incl. unauthenticated CVSS 10.0 command injection in UniFi Connect (CVE-2026-50746)

NCSC-NL published advisory NCSC-2026-0221 on 7 July 2026 covering Ubiquiti's Security Advisory Bulletin 066 (vendor-published 2026-07-02): 25 vulnerabilities spanning the UniFi Connect, Talk, Access, Network and Protect applications plus the UniFi OS platform itself across the Dream Machine / Cloud Gateway / Cloud Key / Network-Video-Recorder / Enterprise-Fortress-Gateway hardware families (NCSC-NL, 2026-07-07). This is a distinct, larger disclosure from the CVE-2026-34908/-34909/-34910 UniFi OS chain covered on 2026-06-24 — different CVEs, broader scope. The most severe, CVE-2026-50746 (CVSS 10.0), is an improper-access-control flaw in UniFi Connect (< 3.4.20) letting a network-adjacent unauthenticated attacker execute OS command injection on the host device; CVE-2026-50747 (CVSS 9.9, authenticated SQLi in Talk), CVE-2026-50748 (CVSS 9.9, command injection in Access), CVE-2026-54402 (CVSS 9.9, command injection in UniFi OS) and CVE-2026-55115 (CVSS 9.9, SSRF in Protect) round out the critical set, and CVE-2026-54403 (CVSS 8.6, path traversal in UniFi OS) bypasses authentication outright and is explicitly flagged by Ubiquiti as chainable to drop the low-privilege prerequisite of the others. SOCRadar confirms no functional public PoC and no confirmed in-the-wild exploitation as of 2026-07-08 (SOCRadar, 2026-07-08).