CVE-2026-8400

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 0.5% (39th percentile of EPSS-scored CVEs). GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, nvd
Trending — 4 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: 0.5%CVSS: 9.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

IBM WebSphere Application Server 8.5, and 9.0 and IBM WebSphere Application Server - Liberty Continuous delivery has a flaw in the ORB component in IBM SDK, Java Technology Edition, may allow a malicious IIOP server to induce loading and instantation of arbitrary classes.

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
44
EG Risk 44/100CISA SSVC

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%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.5%
EPSS %ILE
39th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 5, 2026

Last Modified

August 10, 2026

Advisory Details (1)

Auto-updated Sep 28, 2026
Patch available.
generic

Security Bulletin: Multiple Vulnerabilities in IBM® Java SDK affect IBM WebSphere Application Server and WebSphere Application Server Liberty due to the July 2026 CPU

https://www.ibm.com/support/pages/node/7282446

Vendor Advisories for CVE-2026-8400(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatjava-1.8.0-ibm-1:1.8.0.8.70-1.el8_102026-08-10redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 33× in last 7d / 241× 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 579 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-8400?
CVE-2026-8400 is a critical vulnerability published on August 5, 2026. IBM WebSphere Application Server 8.5, and 9.0 and IBM WebSphere Application Server - Liberty Continuous delivery has a flaw in the ORB component in IBM SDK, Java Technology Edition, may allow a malicious IIOP server to induce loading and instantation of arbitrary classes.
When was CVE-2026-8400 disclosed?
CVE-2026-8400 was first published on August 5, 2026, with the most recent update on August 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-8400 actively exploited?
CVE-2026-8400 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (39th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-8400?
CVE-2026-8400 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-8400?
A fix for CVE-2026-8400 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-8400 are linked in the Vendor Advisories panel on this page.

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