CVE-2026-5268 json
SFTP Server Authentication Weakness
published 2026-07-06 4 mo ago modified 2026-07-08 4 mo ago also EUVD-2026-41884
- cvss
- 9.1
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.7%
- EPSS 0.7% chance of exploitation in 30 days, percentile 52%
- public exploits
- 0
- none known
Summary
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.
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- total
- Assessed
- 4 mo ago
Exploit prediction
0.66% chance of exploitation in the next 30 days, higher than 52% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CISA ADP | 3.1 | 9.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N |
| CNA | 3.1 | 9.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N |
Affected products
- CIENA 6500 S-Series
- CIENA 6500 T-Series
- CIENA PTS
- CIENA CPL
Classification
- Weakness
-
- CWE-288 Authentication Bypass Using an Alternate Path or Channel
References
-
ciena.com
/product-security
vendor-advisory
Sources
- CVE List CVE-2026-5268
- NVD CVE-2026-5268
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