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CVE-2026-5268

SFTP Server Authentication Weakness

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 · 9.1 Critical EPSS < 1% KEV · Not listed
Vendors
Ciena
Products
6500 S-series 6500 T-series Cpl and 1 more