CVE-2026-5267: Ciena Navigator Ncs

High severity, CVSS 7.5. EPSS: 0.4% chance of exploitation in the next 30 days.

Ciena Navigator Network Control Suite (NCS) contains an information exposure vulnerability in an event-streaming API that does not properly enforce authentication. An unauthenticated attacker with network access to the affected service could access the event stream and potentially obtain sensitive information.

Affected products

• Ciena Navigator Ncs: version 8.0 only; version 8.1 only; version 8.2 only; version 9.0 only; version 9.1 only; version 9.2 only; …

Published 2026-09-25. Last modified 2026-09-28.