CIENA 6500 S-Series/6500 T-Series/PTS/CPL SFTP Server improper authorization

Summaryinfo

A vulnerability marked as critical has been reported in CIENA 6500 S-Series, 6500 T-Series, PTS and CPL. The impacted element is an unknown function of the component SFTP Server. This manipulation causes improper authorization. This vulnerability is handled as CVE-2026-5268. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability classified as critical was found in CIENA 6500 S-Series, 6500 T-Series, PTS and CPL (the affected version is unknown). Affected by this vulnerability is an unknown code of the component SFTP Server. The manipulation with an unknown input leads to a improper authorization vulnerability. The CWE definition for the vulnerability is CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at ciena.com. This vulnerability is known as CVE-2026-5268 since 03/31/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 07/06/2026). The attack technique deployed by this issue is T1548.002 according to MITRE ATT&CK.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• CIENA

Name

• 6500 S-Series
• 6500 T-Series
• CPL
• PTS

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