{"id":"CVE-2026-5267","state":"PUBLISHED","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.","publishedAt":"2026-09-25T19:10:46.330Z","updatedAt":"2026-09-25T20:40:31.039Z","severity":{"score":7.5,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","source":"CISA-ADP"},"assigner":"Ciena","products":["Ciena Navigator NCS"],"affected":[{"vendor":"Ciena","product":"Navigator NCS","defaultStatus":"unaffected","versions":[{"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","status":"affected"}]}],"references":["https://www.ciena.com/product-security"],"weaknesses":["CWE-306"],"ingestedAt":"2026-10-29T20:12:32.778Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/5xxx/CVE-2026-5267.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-5267","state":"PUBLISHED","datePublished":"2026-09-25T19:10:46.330Z","dateUpdated":"2026-09-25T20:40:31.039Z","assignerShortName":"Ciena","assignerOrgId":"7bd90cf1-1651-495e-9ae8-9415fb3c9feb","dateReserved":"2026-03-31T19:44:26.584Z"},"containers":{"cna":{"title":"Unauthenticated Event Stream Exposure of Session Tokens in Navigator NCS","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."}],"affected":[{"vendor":"Ciena","product":"Navigator NCS","defaultStatus":"unaffected","versions":[{"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","status":"affected"}]}],"references":[{"url":"https://www.ciena.com/product-security"}],"problemTypes":[{"descriptions":[{"cweId":"CWE-306","lang":"en","description":"CWE-306 Missing authentication for critical function","type":"CWE"}]}],"providerMetadata":{"shortName":"Ciena","orgId":"7bd90cf1-1651-495e-9ae8-9415fb3c9feb","dateUpdated":"2026-09-25T19:10:46.330Z"},"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.

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
"}]}],"credits":[{"lang":"en","value":"Special thanks to Gev Manekshaw","type":"reporter"}],"source":{"discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","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"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-25T20:40:31.039Z"}}]}}}