Auth bypass in Ciena Navigator Ncs
CVE-2026-5267
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.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Ciena Navigator Ncs — versions 10.0, 10.0-P01 through 10.0-P01B, 7.2 and any older release
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-5267?
- CVE-2026-5267 is a high-severity vulnerability in Ciena Navigator Ncs, classified under Missing Authentication for Critical Function. CVSS score: 7.5/10. Published 2026-09-25.
- How severe is CVE-2026-5267?
- High severity. CVSS v3 base score is 7.5 out of 10.