CVE-2026-5270

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-07-15. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.8Exploit: 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 certain releases of Ciena Navigator Network Control Suite (NCS), Manage Control Plan (MCP), and Blue Planet products. The issue is caused by improper handling of HTTP request paths and headers, which allows an unauthenticated attacker to manipulate requests in a manner that bypasses authentication and associated audit logging controls.

CVSS v3
9.8
EG Score
9.8(high)
EG Risk
59(Track)
EG Risk 59/100SSVC: 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
Severity98% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
37%
KEV
Not listed

Published

July 14, 2026

Last Modified

July 15, 2026

References (1)

Vendor Advisories for CVE-2026-5270(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 45× in last 7d / 67× 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. 2026-07-31 16:35 UTCGHSA enrichment
  2. 2026-07-31 12:15 UTCGHSA enrichment
  3. 2026-07-31 07:57 UTCGHSA enrichment
  4. 2026-07-31 03:37 UTCGHSA enrichment
  5. 2026-07-30 23:19 UTCGHSA enrichment
  6. 2026-07-30 19:01 UTCEG score recompute
  7. 2026-07-30 19:01 UTCGHSA enrichment
  8. 2026-07-30 16:28 UTCEPSS rescore
  9. 2026-07-30 14:06 UTCGHSA enrichment
  10. 2026-07-30 09:48 UTCEG score recompute
  11. 2026-07-30 09:48 UTCGHSA enrichment
  12. 2026-07-30 05:30 UTCEG score recompute
  13. 2026-07-30 05:29 UTCGHSA enrichment
  14. 2026-07-30 01:30 UTCEPSS rescore
  15. 2026-07-30 01:30 UTCEPSS rescore
  16. 2026-07-30 01:09 UTCGHSA enrichment
  17. 2026-07-29 20:50 UTCGHSA enrichment
  18. 2026-07-29 15:38 UTCGHSA enrichment
  19. 2026-07-29 11:20 UTCGHSA enrichment
  20. 2026-07-29 07:02 UTCGHSA enrichment
  21. 2026-07-29 02:44 UTCGHSA enrichment
  22. 2026-07-28 22:25 UTCGHSA enrichment
  23. 2026-07-28 17:39 UTCEG score recompute
  24. 2026-07-28 17:39 UTCGHSA enrichment
  25. 2026-07-28 15:37 UTCEPSS rescore
Show 42 more
  1. 2026-07-28 13:20 UTCGHSA enrichment
  2. 2026-07-28 09:01 UTCGHSA enrichment
  3. 2026-07-28 04:43 UTCGHSA enrichment
  4. 2026-07-28 00:25 UTCGHSA enrichment
  5. 2026-07-27 19:44 UTCGHSA enrichment
  6. 2026-07-27 15:17 UTCEG score recompute
  7. 2026-07-27 15:17 UTCGHSA enrichment
  8. 2026-07-27 14:14 UTCEPSS rescore
  9. 2026-07-27 09:19 UTCGHSA enrichment
  10. 2026-07-27 05:01 UTCGHSA enrichment
  11. 2026-07-27 00:36 UTCGHSA enrichment
  12. 2026-07-26 20:17 UTCGHSA enrichment
  13. 2026-07-26 15:57 UTCEG score recompute
  14. 2026-07-26 15:57 UTCGHSA enrichment
  15. 2026-07-26 14:54 UTCEPSS rescore
  16. 2026-07-26 14:54 UTCEPSS rescore
  17. 2026-07-26 11:39 UTCEG score recompute
  18. 2026-07-26 11:39 UTCGHSA enrichment
  19. 2026-07-25 14:18 UTCEPSS rescore
  20. 2026-07-25 14:18 UTCEPSS rescore
  21. 2026-07-24 14:18 UTCEPSS rescore
  22. 2026-07-24 14:18 UTCEPSS rescore
  23. 2026-07-23 14:18 UTCEPSS rescore
  24. 2026-07-23 14:18 UTCEPSS rescore
  25. 2026-07-23 03:19 UTCEG score recompute
  26. 2026-07-22 14:08 UTCEPSS rescore
  27. 2026-07-22 14:08 UTCEPSS rescore
  28. 2026-07-21 15:25 UTCEPSS rescore
  29. 2026-07-21 15:25 UTCEPSS rescore
  30. 2026-07-20 17:08 UTCEPSS rescore
  31. 2026-07-19 14:31 UTCEPSS rescore
  32. 2026-07-19 02:29 UTCEPSS rescore
  33. 2026-07-18 10:04 UTCEPSS rescore
  34. 2026-07-17 06:48 UTCEG score recompute▲ 9.80
  35. 2026-07-17 06:48 UTCGHSA enrichment
  36. 2026-07-16 17:03 UTCEPSS rescore
  37. 2026-07-15 16:57 UTCEPSS rescore
  38. 2026-07-15 16:57 UTCEPSS rescore
  39. 2026-07-15 12:54 UTCMITRE cvelistV5CVSS v3 → 9.8 · severity → CRITICAL
  40. 2026-07-14 23:23 UTCNVD update
  41. 2026-07-14 22:46 UTCEG score recompute
  42. 2026-07-14 22:45 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-5270?
CVE-2026-5270 is a critical vulnerability published on July 14, 2026. An authentication bypass vulnerability exists in certain releases of Ciena Navigator Network Control Suite (NCS), Manage Control Plan (MCP), and Blue Planet products. The issue is caused by improper handling of HTTP request paths and headers, which allows an unauthenticated attacker to manipulate…
When was CVE-2026-5270 disclosed?
CVE-2026-5270 was first published in the National Vulnerability Database on July 14, 2026, with the most recent update on July 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-5270 actively exploited?
CVE-2026-5270 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 63.0% of all scored CVEs.
What is the CVSS score of CVE-2026-5270?
CVE-2026-5270 has a CVSS v3.1 base score of 9.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-5270?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-5270, 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

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