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TI-2026-04604 Aliases CVE-2026-5269GHSA-6jrj-gphg-p8mj

Navigator NCS and MCP System Accounts with Default Passwords

Priority MEDIUM 49CWE-1393Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00483 41st percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
CIENANavigator NCS8.1—No fix listedCNA
CIENAMCPup to 8.0—No fix listedCNA
CIENAPlanner Plus OnPremup to 4.1—No fix listedCNA
  • Navigator NCS VendorCIENA Affected 8.1 Fixed in — No fix listed CNA
  • MCP VendorCIENA Affected up to 8.0 Fixed in — No fix listed CNA
  • Planner Plus OnPrem VendorCIENA Affected up to 4.1 Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-5269
  2. 2026-10-03 Alias added: GHSA-6jrj-gphg-p8mj

References

Other 1

  • TI-2026-04605 Authentication Bypass in Navigator and Blue Planet Products CVSS 3.1CRITICAL 9.8
  • TI-2026-04603 SFTP Server Authentication Weakness CVSS 3.1CRITICAL 9.1
  • TI-2024-01865 SAML implementation allows privilege escalation CVSS 3.1CRITICAL 9.0
  • TI-2026-04602 Unauthenticated Event Stream Exposure of Session Tokens in Navigator NCS CVSS 3.1HIGH 7.5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences