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CVE-2026-5268

CRITICAL
9.1
CVSS 3.1
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.

Metadata

CVE ID
CVE-2026-5268
State
PUBLISHED
Assigner
Ciena
Reserved
2026-03-31 19:44 UTC
Published
2026-07-06 15:25 UTC
Last updated
2026-07-06 18:42 UTC
Primary CWE
CWE-288
CWE-288 Authentication bypass using an alternate path or cha…
Vendor / Product
CIENA / 6500 S-Series
Sources
cve.org  ·  NVD

Severity & Metrics

9.1 CRITICAL CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
SSVC — CISA Coordinator
Exploitation
none
Automatable
yes
Tech. Impact
total
Affected products (4)
VendorProductPlatformVersions
CIENA 6500 S-Series — R16.96 and prior
CIENA 6500 T-Series — R16.1 and prior
CIENA CPL — R12.63 and prior
CIENA PTS — R16.1 and prior
Weakness (CWE)
CWESourceDescription
CWE-288 cna CWE-288 Authentication bypass using an alternate path or channel
CVSS scores (1)
ScoreSeverityVersionSourceVector
9.1 CRITICAL 3.1 adp CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
References (1)
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