CVE-2026-5268

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreMEDIUM 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
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.1Exploit: None knownExposed: 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(medium)
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%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
50%
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 10× in last 7d / 126× 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.

Showing the most recent 100 of 353 total refreshes for this CVE.

  1. 2026-09-11 14:53 UTCEPSS rescore
  2. 2026-09-10 09:35 UTCEPSS rescore
  3. 2026-09-08 22:01 UTCEPSS rescore
  4. 2026-09-07 16:01 UTCEPSS rescore
  5. 2026-09-06 14:11 UTCEG score recompute
  6. 2026-09-06 14:11 UTCGHSA enrichment
  7. 2026-09-06 13:47 UTCEPSS rescore
  8. 2026-09-06 04:39 UTCGHSA enrichment
  9. 2026-09-05 23:12 UTCEG score recompute
  10. 2026-09-05 23:12 UTCGHSA enrichment
  11. 2026-09-04 05:07 UTCEPSS rescore
  12. 2026-09-02 14:12 UTCEPSS rescore
  13. 2026-09-01 13:54 UTCEPSS rescore
  14. 2026-09-01 04:40 UTCEPSS rescore
  15. 2026-08-31 00:41 UTCGHSA enrichment
  16. 2026-08-30 20:49 UTCEG score recompute
  17. 2026-08-30 20:49 UTCGHSA enrichment
  18. 2026-08-30 19:17 UTCEPSS rescore
  19. 2026-08-30 16:58 UTCGHSA enrichment
  20. 2026-08-30 13:04 UTCGHSA enrichment
  21. 2026-08-30 08:15 UTCEG score recompute
  22. 2026-08-30 08:15 UTCGHSA enrichment
  23. 2026-08-30 01:22 UTCEPSS rescore
  24. 2026-08-28 21:42 UTCEPSS rescore
  25. 2026-08-28 02:44 UTCGHSA enrichment
Show 75 more
  1. 2026-08-27 21:59 UTCEG score recompute
  2. 2026-08-27 21:59 UTCGHSA enrichment
  3. 2026-08-27 14:25 UTCEPSS rescore
  4. 2026-08-27 02:17 UTCEG score recompute
  5. 2026-08-27 02:16 UTCGHSA enrichment
  6. 2026-08-26 14:46 UTCEPSS rescore
  7. 2026-08-26 13:55 UTCGHSA enrichment
  8. 2026-08-25 16:00 UTCEG score recompute
  9. 2026-08-25 16:00 UTCGHSA enrichment
  10. 2026-08-25 13:49 UTCEPSS rescore
  11. 2026-08-25 12:02 UTCGHSA enrichment
  12. 2026-08-25 04:33 UTCGHSA enrichment
  13. 2026-08-25 00:42 UTCGHSA enrichment
  14. 2026-08-24 20:48 UTCEG score recompute
  15. 2026-08-24 20:48 UTCGHSA enrichment
  16. 2026-08-24 13:54 UTCGHSA enrichment
  17. 2026-08-24 10:03 UTCEG score recompute
  18. 2026-08-24 10:03 UTCGHSA enrichment
  19. 2026-08-24 05:05 UTCGHSA enrichment
  20. 2026-08-24 01:14 UTCGHSA enrichment
  21. 2026-08-23 21:22 UTCGHSA enrichment
  22. 2026-08-23 17:30 UTCGHSA enrichment
  23. 2026-08-23 13:39 UTCGHSA enrichment
  24. 2026-08-23 09:48 UTCGHSA enrichment
  25. 2026-08-23 05:57 UTCGHSA enrichment
  26. 2026-08-23 01:59 UTCEG score recompute
  27. 2026-08-23 01:59 UTCGHSA enrichment
  28. 2026-08-23 00:19 UTCEPSS rescore
  29. 2026-08-22 21:54 UTCGHSA enrichment
  30. 2026-08-22 18:03 UTCGHSA enrichment
  31. 2026-08-22 12:33 UTCGHSA enrichment
  32. 2026-08-22 08:41 UTCGHSA enrichment
  33. 2026-08-22 04:49 UTCGHSA enrichment
  34. 2026-08-22 00:48 UTCEG score recompute
  35. 2026-08-22 00:48 UTCGHSA enrichment
  36. 2026-08-21 23:49 UTCEPSS rescore
  37. 2026-08-21 20:56 UTCGHSA enrichment
  38. 2026-08-21 17:03 UTCGHSA enrichment
  39. 2026-08-21 12:07 UTCGHSA enrichment
  40. 2026-08-21 08:10 UTCGHSA enrichment
  41. 2026-08-21 04:18 UTCGHSA enrichment
  42. 2026-08-20 23:31 UTCEG score recompute
  43. 2026-08-20 23:31 UTCGHSA enrichment
  44. 2026-08-20 22:55 UTCEPSS rescore
  45. 2026-08-20 19:40 UTCGHSA enrichment
  46. 2026-08-20 15:48 UTCGHSA enrichment
  47. 2026-08-20 10:18 UTCGHSA enrichment
  48. 2026-08-20 06:27 UTCGHSA enrichment
  49. 2026-08-20 02:30 UTCEG score recompute
  50. 2026-08-20 02:30 UTCGHSA enrichment
  51. 2026-08-19 17:04 UTCEPSS rescore
  52. 2026-08-19 16:28 UTCGHSA enrichment
  53. 2026-08-19 12:30 UTCGHSA enrichment
  54. 2026-08-19 08:37 UTCGHSA enrichment
  55. 2026-08-19 04:46 UTCGHSA enrichment
  56. 2026-08-19 00:55 UTCGHSA enrichment
  57. 2026-08-18 20:49 UTCEG score recompute
  58. 2026-08-18 20:49 UTCGHSA enrichment
  59. 2026-08-18 13:48 UTCEPSS rescore
  60. 2026-08-18 10:59 UTCGHSA enrichment
  61. 2026-08-18 03:48 UTCGHSA enrichment
  62. 2026-08-17 22:41 UTCGHSA enrichment
  63. 2026-08-17 14:57 UTCEG score recompute
  64. 2026-08-17 14:57 UTCGHSA enrichment
  65. 2026-08-17 13:47 UTCEPSS rescore
  66. 2026-08-17 11:06 UTCGHSA enrichment
  67. 2026-08-17 07:15 UTCGHSA enrichment
  68. 2026-08-17 03:24 UTCGHSA enrichment
  69. 2026-08-16 23:33 UTCGHSA enrichment
  70. 2026-08-16 19:42 UTCGHSA enrichment
  71. 2026-08-16 15:50 UTCEG score recompute
  72. 2026-08-16 15:50 UTCGHSA enrichment
  73. 2026-08-16 14:56 UTCEPSS rescore
  74. 2026-08-16 11:58 UTCGHSA enrichment
  75. 2026-08-16 08:07 UTCGHSA enrichment

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 1% probability of exploitation in the next 30 days, which ranks it in the top 50.3% of all scored CVEs.
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.

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