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Critical · 9.8 CVE-2026-5269 EUVD-2026-44574GHSA-6jrj-gphg-p8mj

Navigator NCS and MCP System Accounts with Default Passwords

Published Jul 14, 2026 · Updated Jul 15, 2026 · Assigned by Ciena

Description

In Ciena's Navigator Network Control Suite (NCS) and Manage Control Plan (MCP), there are hidden system accounts used for internal software operations. Some of these accounts have default passwords that may be predictable. While these accounts have very limited permissions on their own, an attacker could combine an attack using one of these accounts with other potential weaknesses to launch a more significant attack, possibly leading to escalation of privilege on the system.

Affected products

VendorProductAffectedFixed
CIENA Navigator NCS 8.1 —
CIENA MCP <= 8.0 —
CIENA Planner Plus OnPrem <= 4.1 —

References