{"id":"CVE-2026-5268","state":"PUBLISHED","title":"SFTP Server Authentication Weakness","description":"An authentication bypass vulnerability exists in\nthe default SFTP server component utilized across the Ciena products listed. This vulnerability allows a remote, unauthenticated attacker to bypass\nsecurity controls and gain unauthorized access to the underlying filesystem.\nSuccessful exploitation could allow an attacker to read or modify system files.","publishedAt":"2026-07-06T15:25:56.938Z","updatedAt":"2026-07-08T20:18:06.557Z","severity":{"score":9.1,"label":"Critical","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","source":"CISA-ADP"},"assigner":"Ciena","products":["CIENA 6500 S-Series","CIENA 6500 T-Series","CIENA PTS","CIENA CPL"],"affected":[{"vendor":"CIENA","product":"6500 S-Series","defaultStatus":"unaffected","versions":[{"version":"R16.96 and prior","status":"affected"}]},{"vendor":"CIENA","product":"6500 T-Series","defaultStatus":"unaffected","versions":[{"version":"R16.1 and prior","status":"affected"}]},{"vendor":"CIENA","product":"PTS","defaultStatus":"unaffected","versions":[{"version":"R16.1 and prior","status":"affected"}]},{"vendor":"CIENA","product":"CPL","defaultStatus":"unaffected","versions":[{"version":"R12.63 and prior","status":"affected"}]}],"references":["https://www.ciena.com/product-security"],"weaknesses":["CWE-288"],"ingestedAt":"2026-10-29T20:12:32.778Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/5xxx/CVE-2026-5268.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-5268","state":"PUBLISHED","datePublished":"2026-07-06T15:25:56.938Z","dateUpdated":"2026-07-08T20:18:06.557Z","assignerShortName":"Ciena","assignerOrgId":"7bd90cf1-1651-495e-9ae8-9415fb3c9feb","dateReserved":"2026-03-31T19:44:32.296Z"},"containers":{"cna":{"title":"SFTP Server Authentication Weakness","descriptions":[{"lang":"en","value":"An authentication bypass vulnerability exists in\nthe default SFTP server component utilized across the Ciena products listed. This vulnerability allows a remote, unauthenticated attacker to bypass\nsecurity controls and gain unauthorized access to the underlying filesystem.\nSuccessful exploitation could allow an attacker to read or modify system files."}],"affected":[{"vendor":"CIENA","product":"6500 S-Series","defaultStatus":"unaffected","versions":[{"version":"R16.96 and prior","status":"affected"}]},{"vendor":"CIENA","product":"6500 T-Series","defaultStatus":"unaffected","versions":[{"version":"R16.1 and prior","status":"affected"}]},{"vendor":"CIENA","product":"PTS","defaultStatus":"unaffected","versions":[{"version":"R16.1 and prior","status":"affected"}]},{"vendor":"CIENA","product":"CPL","defaultStatus":"unaffected","versions":[{"version":"R12.63 and prior","status":"affected"}]}],"references":[{"url":"https://www.ciena.com/product-security","tags":["vendor-advisory"]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-288","lang":"en","description":"CWE-288 Authentication bypass using an alternate path or channel","type":"CWE"}]}],"providerMetadata":{"shortName":"Ciena","orgId":"7bd90cf1-1651-495e-9ae8-9415fb3c9feb","dateUpdated":"2026-07-08T20:18:06.557Z"},"solutions":[{"lang":"en","value":"Ciena recommends upgrading to the latest\navailable remediated release. For additional details, refer to myciena.com for\ncurrent software versions, fixes, and security advisories.","supportingMedia":[{"type":"text/html","base64":false,"value":"<p>Ciena recommends upgrading to the latest\navailable remediated release. For additional details, refer to myciena.com for\ncurrent software versions, fixes, and security advisories.</p>"}]}],"x_generator":{"engine":"Vulnogram 1.0.2"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":9.1,"attackVector":"NETWORK","baseSeverity":"CRITICAL","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","integrityImpact":"HIGH","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"NONE","privilegesRequired":"NONE","confidentialityImpact":"HIGH"}},{"other":{"type":"ssvc","content":{"timestamp":"2026-07-06T18:42:35.509616Z","id":"CVE-2026-5268","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-07-06T18:42:39.325Z"}}]}}}