CVE-2026-5269 Navigator NCS and MCP System Accounts with Default Passwords
Hidden system accounts with predictable default passwords in Ciena Navigator NCS and MCP allow attackers to potentially escalate privileges when combined with other weaknesses.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-5269?
CVE-2026-5269 is a critical vulnerability in CIENA MCP, published on 14 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-1393
Which versions are affected by CVE-2026-5269?
How do I fix CVE-2026-5269?
No fix has been published for CVE-2026-5269 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-5269 being exploited?
There is no known exploitation of CVE-2026-5269 in the wild and no public exploit code.
Sources
Also known as GHSA-6jrj-gphg-p8mj.