CVE-2026-5268

Severity CVSS v4.0:

Pending analysis

Type:

Unavailable / Other

Publication date:

06/07/2026

Last modified:

08/07/2026

Description

An authentication bypass vulnerability exists in<br /> the default SFTP server component utilized across the Ciena products listed. This vulnerability allows a remote, unauthenticated attacker to bypass<br /> security controls and gain unauthorized access to the underlying filesystem.<br /> Successful exploitation could allow an attacker to read or modify system files.

Impact

Vector 3.x

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N CVSS v3.1 Severity and Metrics:

Base Score: 9.10 CRITICAL
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): High
Integrity (I): High
Availability (A): None

Base Score 3.x

9.10

Severity 3.x

CRITICAL

References to Advisories, Solutions, and Tools

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