{"api_version":"1","generated_at":"2026-09-25T22:11:22+00:00","cve":"CVE-2026-5267","urls":{"html":"https://cve.report/CVE-2026-5267","api":"https://cve.report/api/cve/CVE-2026-5267.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-5267","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-5267"},"summary":{"title":"Unauthenticated Event Stream Exposure of Session Tokens in Navigator NCS","description":"Ciena Navigator Network\nControl Suite (NCS) contains an information exposure vulnerability in an\nevent-streaming API that does not properly enforce authentication. An\nunauthenticated attacker with network access to the affected service could\naccess the event stream and potentially obtain sensitive information.","state":"PUBLISHED","assigner":"Ciena","published_at":"2026-09-25 20:17:11","updated_at":"2026-09-25 21:17:23"},"problem_types":["CWE-306","CWE-306 CWE-306 Missing authentication for critical function"],"metrics":[{"version":"3.1","source":"ADP","type":"DECLARED","score":"7.5","severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","data":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","version":"3.1"}},{"version":"3.1","source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","type":"Secondary","score":"7.5","severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","baseScore":7.5,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"NONE","availabilityImpact":"NONE"}}],"references":[{"url":"https://www.ciena.com/product-security","name":"https://www.ciena.com/product-security","refsource":"7bd90cf1-1651-495e-9ae8-9415fb3c9feb","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-5267","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-5267","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Ciena","product":"Navigator NCS","version":"affected 7.2 and any older release","platforms":[]},{"source":"CNA","vendor":"Ciena","product":"Navigator NCS","version":"affected 7.2-P01 through 7.2-P07","platforms":[]},{"source":"CNA","vendor":"Ciena","product":"Navigator NCS","version":"affected 8.0","platforms":[]},{"source":"CNA","vendor":"Ciena","product":"Navigator NCS","version":"affected 8.0-P01 through 8.0-P06A","platforms":[]},{"source":"CNA","vendor":"Ciena","product":"Navigator NCS","version":"affected 8.1","platforms":[]},{"source":"CNA","vendor":"Ciena","product":"Navigator NCS","version":"affected 8.1-P01 through 8.1-P06","platforms":[]},{"source":"CNA","vendor":"Ciena","product":"Navigator NCS","version":"affected 8.2","platforms":[]},{"source":"CNA","vendor":"Ciena","product":"Navigator NCS","version":"affected 8.2-P01 through 8.2-P06","platforms":[]},{"source":"CNA","vendor":"Ciena","product":"Navigator NCS","version":"affected 9.0","platforms":[]},{"source":"CNA","vendor":"Ciena","product":"Navigator NCS","version":"affected 9.0-P01 through 9.0-P05A","platforms":[]},{"source":"CNA","vendor":"Ciena","product":"Navigator NCS","version":"affected 9.1","platforms":[]},{"source":"CNA","vendor":"Ciena","product":"Navigator NCS","version":"affected 9.1-P01 through 9.1-P05","platforms":[]},{"source":"CNA","vendor":"Ciena","product":"Navigator NCS","version":"affected 9.2","platforms":[]},{"source":"CNA","vendor":"Ciena","product":"Navigator NCS","version":"affected 9.2-P01 through 9.2-P02","platforms":[]},{"source":"CNA","vendor":"Ciena","product":"Navigator NCS","version":"affected 10.0","platforms":[]},{"source":"CNA","vendor":"Ciena","product":"Navigator NCS","version":"affected 10.0-P01 through 10.0-P01B","platforms":[]}],"timeline":[],"solutions":[{"source":"CNA","title":"","value":"Ciena recommends upgrading to the latest available remediated release. For additional details, refer to myciena.com for current software versions, fixes, and security advisories.\n\nRemediation and Fixes: \n\n\n\n\n \n \n \n\n Products \n\n\n \n \n \n\nRemediated Version\n\n\n \n \n \n \n \n\nNavigator NCS\n\n\n \n \n \n\n8.0-P06B and\n later\n\n\n \n\n8.1-P06A and\n later\n\n\n \n\n8.2-P07 and\n later\n\n\n \n\n9.0-P05B and\n later\n\n\n \n\n9.1-P05A and\n later\n\n\n \n\n9.2-P02A and\n later\n\n\n \n\n10.0-P01C and later","time":"","lang":"en"}],"workarounds":[],"exploits":[],"credits":[{"source":"CNA","value":"Special thanks to Gev Manekshaw","lang":"en"}],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"adp":[{"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","version":"3.1"}},{"other":{"content":{"id":"CVE-2026-5267","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","timestamp":"2026-09-25T20:40:10.302755Z","version":"2.0.3"},"type":"ssvc"}}],"providerMetadata":{"dateUpdated":"2026-09-25T20:40:31.039Z","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP"},"title":"CISA ADP Vulnrichment"}],"cna":{"affected":[{"defaultStatus":"unaffected","product":"Navigator NCS","vendor":"Ciena","versions":[{"status":"affected","version":"7.2 and any older release"},{"status":"affected","version":"7.2-P01 through 7.2-P07"},{"status":"affected","version":"8.0"},{"status":"affected","version":"8.0-P01 through 8.0-P06A"},{"status":"affected","version":"8.1"},{"status":"affected","version":"8.1-P01 through 8.1-P06"},{"status":"affected","version":"8.2"},{"status":"affected","version":"8.2-P01 through 8.2-P06"},{"status":"affected","version":"9.0"},{"status":"affected","version":"9.0-P01 through 9.0-P05A"},{"status":"affected","version":"9.1"},{"status":"affected","version":"9.1-P01 through 9.1-P05"},{"status":"affected","version":"9.2"},{"status":"affected","version":"9.2-P01 through 9.2-P02"},{"status":"affected","version":"10.0"},{"status":"affected","version":"10.0-P01 through 10.0-P01B"}]}],"credits":[{"lang":"en","type":"reporter","value":"Special thanks to Gev Manekshaw"}],"descriptions":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"

Ciena Navigator Network\nControl Suite (NCS) contains an information exposure vulnerability in an\nevent-streaming API that does not properly enforce authentication. An\nunauthenticated attacker with network access to the affected service could\naccess the event stream and potentially obtain sensitive information.

"}],"value":"Ciena Navigator Network\nControl Suite (NCS) contains an information exposure vulnerability in an\nevent-streaming API that does not properly enforce authentication. An\nunauthenticated attacker with network access to the affected service could\naccess the event stream and potentially obtain sensitive information."}],"problemTypes":[{"descriptions":[{"cweId":"CWE-306","description":"CWE-306 Missing authentication for critical function","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2026-09-25T19:10:46.330Z","orgId":"7bd90cf1-1651-495e-9ae8-9415fb3c9feb","shortName":"Ciena"},"references":[{"url":"https://www.ciena.com/product-security"}],"solutions":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"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:

\n\n\n \n \n \n \n \n \n \n \n
\n

 Products

\n 		\n

Remediated Version

\n
\n

Navigator NCS

\n 		\n

8.0-P06B and\n later

\n

8.1-P06A and\n later

\n

8.2-P07 and\n later

\n

9.0-P05B and\n later

\n

9.1-P05A and\n later

\n

9.2-P02A and\n later

\n

10.0-P01C and later

\n
"}],"value":"Ciena recommends upgrading to the latest available remediated release. For additional details, refer to myciena.com for current software versions, fixes, and security advisories.\n\nRemediation and Fixes: \n\n\n\n\n \n \n \n\n Products \n\n\n \n \n \n\nRemediated Version\n\n\n \n \n \n \n \n\nNavigator NCS\n\n\n \n \n \n\n8.0-P06B and\n later\n\n\n \n\n8.1-P06A and\n later\n\n\n \n\n8.2-P07 and\n later\n\n\n \n\n9.0-P05B and\n later\n\n\n \n\n9.1-P05A and\n later\n\n\n \n\n9.2-P02A and\n later\n\n\n \n\n10.0-P01C and later"}],"source":{"discovery":"UNKNOWN"},"title":"Unauthenticated Event Stream Exposure of Session Tokens in Navigator NCS","x_generator":{"engine":"Vulnogram 1.0.1"}}},"cveMetadata":{"assignerOrgId":"7bd90cf1-1651-495e-9ae8-9415fb3c9feb","assignerShortName":"Ciena","cveId":"CVE-2026-5267","datePublished":"2026-09-25T19:10:46.330Z","dateReserved":"2026-03-31T19:44:26.584Z","dateUpdated":"2026-09-25T20:40:31.039Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-25 20:17:11","lastModifiedDate":"2026-09-25 21:17:23","problem_types":["CWE-306","CWE-306 CWE-306 Missing authentication for critical function"],"metrics":{"cvssMetricV31":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","baseScore":7.5,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"NONE","availabilityImpact":"NONE"},"exploitabilityScore":3.9,"impactScore":3.6}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-09-25T20:40:10.302755Z","id":"CVE-2026-5267","options":[{"exploitation":"none"},{"automatable":"yes"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"5267","Ordinal":"1","Title":"Unauthenticated Event Stream Exposure of Session Tokens in Navig","CVE":"CVE-2026-5267","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"5267","Ordinal":"1","NoteData":"Ciena Navigator Network\nControl Suite (NCS) contains an information exposure vulnerability in an\nevent-streaming API that does not properly enforce authentication. An\nunauthenticated attacker with network access to the affected service could\naccess the event stream and potentially obtain sensitive information.","Type":"Description","Title":"Unauthenticated Event Stream Exposure of Session Tokens in Navig"}]}}}