{"id":"CVE-2026-5267","aliases":["EUVD-2026-87295","GHSA-6mqq-ppj3-rm94"],"status":"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.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high","assessor":"adp","from":"cve"},"epss":{"day":"2026-11-10","score":0.0036,"percentile":0.30118,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-306"],"published":"2026-09-25T19:10:46Z","modified":"2026-09-28T16:31:16Z","products":[{"vendor":"ciena","product":"navigator ncs"}],"references":[{"url":"https://www.ciena.com/product-security"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-5267"},{"url":"https://github.com/advisories/GHSA-6mqq-ppj3-rm94"}],"sources":{"cve":[{"id":"CVE-2026-5267","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.","status":"published","published":"2026-09-25T19:10:46.33Z","modified":"2026-09-25T20:40:31.039Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high","assessor":"adp"}],"cwes":["CWE-306"],"updated_at":"2026-11-02T13:39:39.001586Z"}],"euvd":[{"id":"EUVD-2026-87295","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.","status":"published","published":"2026-09-25T19:10:46Z","modified":"2026-09-25T20:40:31Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"updated_at":"2026-11-02T17:27:54.622662Z"}],"ghsa":[{"id":"GHSA-6mqq-ppj3-rm94","title":"Ciena Navigator Network\nControl Suite (NCS) contains an information exposure vulnerability in an...","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.","status":"published","published":"2026-09-25T21:33:03Z","modified":"2026-09-25T21:33:11Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"cwes":["CWE-306"],"updated_at":"2026-11-02T15:12:27.845198Z"}],"nvd":[{"id":"CVE-2026-5267","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.","status":"published","published":"2026-09-25T20:17:11.613Z","modified":"2026-09-28T16:31:16.073Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high","assessor":"secondary"}],"cwes":["CWE-306"],"updated_at":"2026-11-02T14:12:51.721923Z"}]}}