CVE-2026-5268

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.

Score

CVSS 3.1 9.1 Critical

Status

Awaiting Analysis - 7bd90cf1-1651-495e-9ae8-9415fb3c9feb

Published

2026-07-06

Last modified

2026-07-08

Weaknesses

CWE-288

Affected products

• 6500 S-series (Ciena)
• 6500 T-series (Ciena)
• Cpl (Ciena)
• Pts (Ciena)

References

• https://www.ciena.com/product-security