CVE-2026-5268

CriticalCVSS 9.1/10Last modified Jul 8, 2026

Description

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.

Metrics

CVSS 3.1 9.1/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Weakness enumeration

CWE-288

Affected software

Source: the vendor's advisory (CNA). NVD analysis pending.

Vendor	Product	Versions
CIENA	6500 S-Series	R16.96 and prior
CIENA	6500 T-Series	R16.1 and prior
CIENA	PTS	R16.1 and prior
CIENA	CPL	R12.63 and prior

References

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

Timeline

Published: Jul 6, 2026
Last modified: Jul 8, 2026
NVD status: Awaiting Analysis

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