{"id":"CVE-2026-5268","aliases":["EUVD-2026-41884","GHSA-m6c7-7xhp-6vhc"],"status":"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.","severity":{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical","assessor":"adp","from":"cve"},"epss":{"day":"2026-11-11","score":0.00665,"percentile":0.52221,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-288"],"published":"2026-07-06T15:25:56Z","modified":"2026-07-08T21:16:54Z","products":[{"vendor":"ciena","product":"6500 s-series"},{"vendor":"ciena","product":"6500 t-series"},{"vendor":"ciena","product":"cpl"},{"vendor":"ciena","product":"pts"}],"references":[{"url":"https://www.ciena.com/product-security","tags":["vendor-advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-5268"},{"url":"https://github.com/advisories/GHSA-m6c7-7xhp-6vhc"}],"sources":{"cve":[{"id":"CVE-2026-5268","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.","status":"published","published":"2026-07-06T15:25:56.938Z","modified":"2026-07-08T20:18:06.557Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical","assessor":"adp"}],"cwes":["CWE-288"],"updated_at":"2026-11-02T13:39:16.730222Z"}],"euvd":[{"id":"EUVD-2026-41884","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.","status":"published","published":"2026-07-06T15:25:56Z","modified":"2026-07-08T20:18:06Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical"}],"updated_at":"2026-11-02T18:20:10.095263Z"}],"ghsa":[{"id":"GHSA-m6c7-7xhp-6vhc","title":"An authentication bypass vulnerability exists in\nthe default SFTP server component utilized...","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.","status":"published","published":"2026-07-06T18:31:14Z","modified":"2026-07-06T21:31:45Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical"}],"cwes":["CWE-288"],"updated_at":"2026-11-02T15:09:18.163038Z"}],"nvd":[{"id":"CVE-2026-5268","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.","status":"published","published":"2026-07-06T16:16:38.433Z","modified":"2026-07-08T21:16:54.663Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical","assessor":"secondary"}],"cwes":["CWE-288"],"updated_at":"2026-11-02T14:12:28.040501Z"}]}}