CVE-2026-5268

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreHIGH confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-07-06. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 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: 0%CVSS: 9.1Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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
9.1
EG Score
9.1(high)
EG Risk
56(Track)
EG Risk 56/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity91% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
34.4%
KEV
Not listed

Published

July 6, 2026

Last Modified

July 8, 2026

References (1)

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 13× in last 7d / 80× 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.

  1. 2026-07-23 14:18 UTCEPSS rescore
  2. 2026-07-23 14:18 UTCEPSS rescore
  3. 2026-07-23 03:19 UTCEG score recompute
  4. 2026-07-22 14:08 UTCEPSS rescore
  5. 2026-07-22 14:08 UTCEPSS rescore
  6. 2026-07-21 15:25 UTCEPSS rescore
  7. 2026-07-21 15:25 UTCEPSS rescore
  8. 2026-07-20 17:08 UTCEPSS rescore
  9. 2026-07-19 02:29 UTCEPSS rescore
  10. 2026-07-18 10:04 UTCEPSS rescore
  11. 2026-07-17 06:05 UTCGHSA enrichment
  12. 2026-07-17 02:14 UTCGHSA enrichment
  13. 2026-07-16 22:21 UTCGHSA enrichment
  14. 2026-07-16 18:30 UTCGHSA enrichment
  15. 2026-07-16 17:03 UTCEPSS rescore
  16. 2026-07-16 14:39 UTCGHSA enrichment
  17. 2026-07-16 10:47 UTCGHSA enrichment
  18. 2026-07-16 06:42 UTCGHSA enrichment
  19. 2026-07-16 02:49 UTCGHSA enrichment
  20. 2026-07-15 22:58 UTCGHSA enrichment
  21. 2026-07-15 19:06 UTCGHSA enrichment
  22. 2026-07-15 16:57 UTCEPSS rescore
  23. 2026-07-15 16:57 UTCEPSS rescore
  24. 2026-07-15 15:14 UTCGHSA enrichment
  25. 2026-07-15 11:22 UTCGHSA enrichment
Show 55 more
  1. 2026-07-15 07:29 UTCGHSA enrichment
  2. 2026-07-15 03:37 UTCGHSA enrichment
  3. 2026-07-15 02:00 UTCEPSS rescore
  4. 2026-07-15 02:00 UTCEPSS rescore
  5. 2026-07-14 23:43 UTCGHSA enrichment
  6. 2026-07-14 19:52 UTCGHSA enrichment
  7. 2026-07-14 16:01 UTCGHSA enrichment
  8. 2026-07-14 12:10 UTCGHSA enrichment
  9. 2026-07-14 08:19 UTCGHSA enrichment
  10. 2026-07-14 04:28 UTCGHSA enrichment
  11. 2026-07-14 00:35 UTCGHSA enrichment
  12. 2026-07-13 22:31 UTCEPSS rescore
  13. 2026-07-13 20:44 UTCGHSA enrichment
  14. 2026-07-13 16:53 UTCGHSA enrichment
  15. 2026-07-13 13:01 UTCGHSA enrichment
  16. 2026-07-13 09:09 UTCGHSA enrichment
  17. 2026-07-13 06:13 UTCEPSS rescore
  18. 2026-07-13 06:13 UTCEPSS rescore
  19. 2026-07-13 05:17 UTCGHSA enrichment
  20. 2026-07-13 01:25 UTCGHSA enrichment
  21. 2026-07-12 21:34 UTCGHSA enrichment
  22. 2026-07-12 17:42 UTCGHSA enrichment
  23. 2026-07-12 13:51 UTCGHSA enrichment
  24. 2026-07-12 09:57 UTCGHSA enrichment
  25. 2026-07-12 06:05 UTCGHSA enrichment
  26. 2026-07-12 05:46 UTCEPSS rescore
  27. 2026-07-12 02:12 UTCGHSA enrichment
  28. 2026-07-11 22:20 UTCGHSA enrichment
  29. 2026-07-11 18:29 UTCGHSA enrichment
  30. 2026-07-11 14:38 UTCGHSA enrichment
  31. 2026-07-11 10:47 UTCGHSA enrichment
  32. 2026-07-11 08:27 UTCEPSS rescore
  33. 2026-07-11 08:27 UTCEPSS rescore
  34. 2026-07-11 06:56 UTCGHSA enrichment
  35. 2026-07-11 03:05 UTCGHSA enrichment
  36. 2026-07-10 23:11 UTCGHSA enrichment
  37. 2026-07-10 19:20 UTCGHSA enrichment
  38. 2026-07-10 15:28 UTCGHSA enrichment
  39. 2026-07-10 11:35 UTCGHSA enrichment
  40. 2026-07-10 07:43 UTCGHSA enrichment
  41. 2026-07-10 03:51 UTCGHSA enrichment
  42. 2026-07-09 23:59 UTCGHSA enrichment
  43. 2026-07-09 20:08 UTCGHSA enrichment
  44. 2026-07-09 19:10 UTCEPSS rescore
  45. 2026-07-09 19:10 UTCEPSS rescore
  46. 2026-07-09 16:17 UTCEG score recompute▲ 9.10
  47. 2026-07-09 16:16 UTCGHSA enrichment
  48. 2026-07-08 15:16 UTCEPSS rescore
  49. 2026-07-08 15:16 UTCEPSS rescore
  50. 2026-07-07 13:46 UTCEPSS rescore
  51. 2026-07-07 13:46 UTCEPSS rescore
  52. 2026-07-06 19:06 UTCMITRE cvelistV5CVSS v3 → 9.1 · severity → CRITICAL
  53. 2026-07-06 18:21 UTCNVD update
  54. 2026-07-06 15:36 UTCEG score recompute
  55. 2026-07-06 15:36 UTCMITRE cvelistV5first tracked

Frequently asked(5)

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, with the most recent update on July 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-5268 actively exploited?
CVE-2026-5268 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 34.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
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).
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

Explore →

Is Your Infrastructure Affected by CVE-2026-5268?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs