{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-5267","assignerOrgId":"7bd90cf1-1651-495e-9ae8-9415fb3c9feb","state":"PUBLISHED","assignerShortName":"Ciena","dateReserved":"2026-03-31T19:44:26.584Z","datePublished":"2026-09-25T19:10:46.330Z","dateUpdated":"2026-09-25T20:40:31.039Z"},"containers":{"cna":{"providerMetadata":{"orgId":"7bd90cf1-1651-495e-9ae8-9415fb3c9feb","shortName":"Ciena","dateUpdated":"2026-09-25T19:10:46.330Z"},"title":"Unauthenticated Event Stream Exposure of Session Tokens in Navigator NCS","problemTypes":[{"descriptions":[{"lang":"en","cweId":"CWE-306","description":"CWE-306 Missing authentication for critical function","type":"CWE"}]}],"affected":[{"vendor":"Ciena","product":"Navigator NCS","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"}],"defaultStatus":"unaffected"}],"descriptions":[{"lang":"en","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.","supportingMedia":[{"type":"text/html","base64":false,"value":"<p>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.</p>"}]}],"references":[{"url":"https://www.ciena.com/product-security"}],"x_generator":{"engine":"Vulnogram 1.0.1"},"solutions":[{"lang":"en","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","supportingMedia":[{"type":"text/html","base64":false,"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.<div><p><b>Remediation and Fixes: </b></p>\n\n<table>\n <tbody><tr>\n  <td>\n  <p><b>&nbsp;Products </b></p>\n  </td>\n  <td>\n  <p><b>Remediated Version</b></p>\n  </td>\n </tr>\n <tr>\n  <td>\n  <p>Navigator NCS</p>\n  </td>\n  <td>\n  <p>8.0-P06B and\n  later</p>\n  <p>8.1-P06A and\n  later</p>\n  <p>8.2-P07 and\n  later</p>\n  <p>9.0-P05B and\n  later</p>\n  <p>9.1-P05A and\n  later</p>\n  <p>9.2-P02A and\n  later</p>\n  <p>10.0-P01C and later</p>\n  </td>\n </tr>\n</tbody></table></div>"}]}],"credits":[{"lang":"en","value":"Special thanks to Gev Manekshaw","type":"reporter"}],"source":{"discovery":"UNKNOWN"}},"adp":[{"metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":7.5,"attackVector":"NETWORK","baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","integrityImpact":"NONE","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"NONE","privilegesRequired":"NONE","confidentialityImpact":"HIGH"}},{"other":{"type":"ssvc","content":{"timestamp":"2026-09-25T20:40:10.302755Z","id":"CVE-2026-5267","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-09-25T20:40:31.039Z"}}]}}