CVE-2026-5267

Unauthenticated Event Stream Exposure of Session Tokens in Navigator NCS

Published Sep 25, 2026 CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
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.

Remediation

Vendor Solution

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

Tracking

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Advisories

No advisories available
References
History
Type Values Removed Values Added
First Time appeared Ciena
Ciena navigator Ncs
Vendors & Products Ciena
Ciena navigator Ncs
Type Values Removed Values Added
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title Unauthenticated Event Stream Exposure of Session Tokens in Navigator NCS
Weaknesses CWE-306
References
Weaknesses

Sources

Status
PUBLISHED
Assigner
Ciena
Published
Updated
Sep 25, 2026, 8:40 PM
Reserved
Mar 31, 2026, 7:44 PM
Status
Deferred
Published
Sep 25, 2026, 8:17 PM
Modified
Sep 28, 2026, 4:31 PM