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CVE-2026-5267

Unauthenticated Event Stream Exposure of Session Tokens in Navigator NCS

High7.5EPSS 0.36%
Published
Updated
Reserved
Assigned by
Ciena

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.

Scores

CVSS scores of CVE-2026-5267, by who scored it
Scored byCVSSScoreVector
CISA-ADPADP (enrichment)3.1High7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
NVDNVD · Deferred3.1High7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
EPSS (exploitation in 30 days)
0.36% · top 70% of all CVEs (6 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: yes · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.

Weakness

Affected products

  • Ciena · Navigator NCS

    • affected 7.2 and any older release
    • affected 7.2-P01 through 7.2-P07
    • affected 8.0
    • affected 8.0-P01 through 8.0-P06A
    • affected 8.1
    • affected 8.1-P01 through 8.1-P06
    • affected 8.2
    • affected 8.2-P01 through 8.2-P06
    • affected 9.0
    • affected 9.0-P01 through 9.0-P05A
    • affected 9.1
    • affected 9.1-P01 through 9.1-P05
    • affected 9.2
    • affected 9.2-P01 through 9.2-P02
    • affected 10.0
    • affected 10.0-P01 through 10.0-P01B

What to do

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

References (1)

Sources

The same CVE in the primary databases and aggregators, to check against.

Badge for a README or a ticket

CVE-2026-5267 badge
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Record last updated .