Unauthenticated Event Stream Exposure of Session Tokens in Navigator NCS

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-5267
StatePUBLISHED
AssignerCiena
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-25 20:17:11 UTC
Updated2026-09-25 21:17:23 UTC
DescriptionCiena 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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from ADP

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Problem Types: CWE-306 | CWE-306 CWE-306 Missing authentication for critical function

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Ciena Navigator NCS affected 7.2 and any older release Not specified
CNA Ciena Navigator NCS affected 7.2-P01 through 7.2-P07 Not specified
CNA Ciena Navigator NCS affected 8.0 Not specified
CNA Ciena Navigator NCS affected 8.0-P01 through 8.0-P06A Not specified
CNA Ciena Navigator NCS affected 8.1 Not specified
CNA Ciena Navigator NCS affected 8.1-P01 through 8.1-P06 Not specified
CNA Ciena Navigator NCS affected 8.2 Not specified
CNA Ciena Navigator NCS affected 8.2-P01 through 8.2-P06 Not specified
CNA Ciena Navigator NCS affected 9.0 Not specified
CNA Ciena Navigator NCS affected 9.0-P01 through 9.0-P05A Not specified
CNA Ciena Navigator NCS affected 9.1 Not specified
CNA Ciena Navigator NCS affected 9.1-P01 through 9.1-P05 Not specified
CNA Ciena Navigator NCS affected 9.2 Not specified
CNA Ciena Navigator NCS affected 9.2-P01 through 9.2-P02 Not specified
CNA Ciena Navigator NCS affected 10.0 Not specified
CNA Ciena Navigator NCS affected 10.0-P01 through 10.0-P01B Not specified

References

ReferenceSourceLinkTags
www.ciena.com/product-security 7bd90cf1-1651-495e-9ae8-9415fb3c9feb www.ciena.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Special thanks to Gev Manekshaw (en)

Additional Advisory Data

Solutions

CNA: Ciena recommends upgrading to the latest available remediated release. For additional details, refer to myciena.com for current software versions, fixes, and security advisories. Remediation and Fixes:  Products Remediated Version Navigator NCS 8.0-P06B and later 8.1-P06A and later 8.2-P07 and later 9.0-P05B and later 9.1-P05A and later 9.2-P02A and later 10.0-P01C and later

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