CVE-2026-5268: CWE-288 Authentication bypass using an alternate path or channel in CIENA 6500 S-Series
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.
AI Analysis
Technical Summary
An authentication bypass vulnerability (CWE-288) exists in the default SFTP server component utilized by CIENA 6500 S-Series products. This vulnerability permits a remote, unauthenticated attacker to circumvent security controls and gain unauthorized access to the underlying filesystem. Successful exploitation could lead to reading or modifying system files. The vulnerability has a CVSS 3.1 base score of 9.1, indicating high impact on confidentiality and integrity with no required privileges or user interaction. No remediation level or patch information has been disclosed by the vendor as of the publication date.
Potential Impact
A remote attacker can bypass authentication on the SFTP server component without any privileges or user interaction, potentially gaining unauthorized access to the filesystem. This could result in unauthorized reading or modification of system files, compromising system confidentiality and integrity. Availability impact is not indicated.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no official fix or remediation level is provided, monitor CIENA's advisories for updates. Until a patch is available, restrict network access to the affected SFTP service where possible to limit exposure.
CVE-2026-5268: CWE-288 Authentication bypass using an alternate path or channel in CIENA 6500 S-Series
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.
CVSS v3.1
Score 9.1critical
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
An authentication bypass vulnerability (CWE-288) exists in the default SFTP server component utilized by CIENA 6500 S-Series products. This vulnerability permits a remote, unauthenticated attacker to circumvent security controls and gain unauthorized access to the underlying filesystem. Successful exploitation could lead to reading or modifying system files. The vulnerability has a CVSS 3.1 base score of 9.1, indicating high impact on confidentiality and integrity with no required privileges or user interaction. No remediation level or patch information has been disclosed by the vendor as of the publication date.
Potential Impact
A remote attacker can bypass authentication on the SFTP server component without any privileges or user interaction, potentially gaining unauthorized access to the filesystem. This could result in unauthorized reading or modification of system files, compromising system confidentiality and integrity. Availability impact is not indicated.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no official fix or remediation level is provided, monitor CIENA's advisories for updates. Until a patch is available, restrict network access to the affected SFTP service where possible to limit exposure.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Ciena
- Date Reserved
- 2026-03-31T19:44:32.296Z
- Cvss Version
- null
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a4bcbb327e9c79719c0cec5
Added to database: 07/06/2026, 15:37:23 UTC
Last enriched: 07/14/2026, 08:43:51 UTC
Last updated: 08/19/2026, 22:52:13 UTC
Views: 100
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