CVE-2026-5267
High
Description
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.
SeverityHigh
CVSS7.5
Exploit probability—
ProductNavigator NCS
PublishedSep 25, 2026
First seenSep 25, 2026
Weakness typeCWE-306Missing authentication for critical function
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Ciena Navigator NCS | 7.2 and any older release, 7.2-P01 through 7.2-P07, 8.0, 8.0-P01 through 8.0-P06A, 8.1, 8.1-P01 through 8.1-P06, 8.2, 8.2-P01 through 8.2-P06, 9.0, 9.0-P01 through 9.0-P05A, 9.1, 9.1-P01 through 9.1-P05, 9.2, 9.2-P01 through 9.2-P02, 10.0, 10.0-P01 through 10.0-P01B | — |
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