CVE-2026-5268criticalCWE-288

CVE-2026-5268: critical vulnerability in CIENA 6500 S-Series

SFTP Server Authentication Weakness

Published · Updated

Follow this CVE+ Monitor 6500 S-Series+ Monitor 6500 T-Series

E-mail alert when it lands in KEV, gets a public PoC or its score goes up.

28Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 9.1epss 0.7%
An authentication bypass vulnerability exists in the default SFTP server component utilized across the Ciena products listed. This vulnerability allows a remote, unauthenticated attacker to bypass security controls and gain unauthorized access to the underlying filesystem. Successful exploitation could allow an attacker to read or modify system files.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Affected products
CIENA · 6500 S-SeriesCIENA · 6500 T-SeriesCIENA · CPLCIENA · PTS