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.
CVE-2026-5268
CRITICALPre-NVD 9.1Trending — 3 sources updated this week
9.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: —CVSS: 9.1Exploit: NoneExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 9.1
- EG Score
- 0.0(none)
- EPSS
- —
- KEV
- Not listed
Published
July 6, 2026
Last Modified
July 6, 2026
References (1)
- 7bd90cf1-1651-495e-9ae8-9415fb3c9febhttps://www.ciena.com/product-security
Vendor Advisories for CVE-2026-5268(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 4× in last 7d / 4× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-07-06 19:06 UTCMITRE cvelistV5CVSS v3 → 9.1 · severity → CRITICAL
- 2026-07-06 18:21 UTCNVD update
- 2026-07-06 15:36 UTCEG score recompute
- 2026-07-06 15:36 UTCMITRE cvelistV5first tracked
Frequently asked(4)
What is CVE-2026-5268?
CVE-2026-5268 is a critical vulnerability published on July 6, 2026. 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…
When was CVE-2026-5268 disclosed?
CVE-2026-5268 was first published in the National Vulnerability Database on July 6, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
What is the CVSS score of CVE-2026-5268?
CVE-2026-5268 has a CVSS v3.1 base score of 9.1 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 0.0.
How do I remediate CVE-2026-5268?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-5268, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2026-5268
Is Your Infrastructure Affected by CVE-2026-5268?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.