Vulnerability in Ciena Mcp
CVE-2026-5269
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.005 (40.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 40th percentile — 40.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
- Ciena Mcp — versions <= 8.0
- Ciena Navigator Ncs — versions 8.1
- Ciena Planner Plus Onprem — versions <= 4.1
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-5269?
- CVE-2026-5269 is a critical-severity vulnerability in Ciena Mcp, classified under CWE-1393. CVSS score: 9.8/10. Published 2026-07-14.
- How severe is CVE-2026-5269?
- Critical severity. CVSS v3 base score is 9.8 out of 10.