CVE-2026-5269

Navigator NCS and MCP System Accounts with Default Passwords

Published Jul 14, 2026 CVSS 3.1 · 9.8 Critical EPSS < 1% KEV · Not listed
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.

Remediation

Vendor Solution

Ciena recommends upgrading to the latest available remediated release. For additional details, refer to myciena.com for current software versions, fixes, and security advisories.   Remediation and Fixes:  Products Remediated Version Navigator NCS >= 8.2, 8.1-P02 MCP 8.0-P04, 7.2-P07 Planner Plus OnPrem >= 4.2, 4.1-P01

Tracking

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Advisories

No advisories available
References
History
Type Values Removed Values Added
First Time appeared Ciena
Ciena mcp
Ciena navigator Ncs
Ciena planner Plus Onprem
Vendors & Products Ciena
Ciena mcp
Ciena navigator Ncs
Ciena planner Plus Onprem
Type Values Removed Values Added
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title Navigator NCS and MCP System Accounts with Default Passwords
Weaknesses CWE-1393
References
Weaknesses

Sources

Status
PUBLISHED
Assigner
Ciena
Published
Updated
Jul 15, 2026, 2:30 PM
Reserved
Mar 31, 2026, 7:44 PM
Status
Awaiting Analysis
Published
Jul 14, 2026, 11:17 PM
Modified
Jul 15, 2026, 8:08 PM