CVE-2026-9311

CRITICALPre-NVD 9.09.0—
EchelonGraph scoreMEDIUM confidence

Score 9.0 from GitHub Security Advisory (severity: CRITICAL) published 2026-06-01. a secondary CVSS source baseline 9.0; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
9.0EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.0Exploit: None knownExposed: 0

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

IBM WebSphere Application Server 9.0, and 8.5 is vulnerable to remote code execution caused by the bypass of security controls.

CVSS v3
9.0
EG Score
9.0(medium)
EG Risk
41(Track)
EG Risk 41/100SSVC: 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
Severity90% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
42%
KEV
Not listed

Published

June 1, 2026

Last Modified

July 22, 2026

Advisory Details (1)

Auto-updated Jun 2, 2026
No patch confirmed yet.
generic

Security Bulletin: IBM WebSphere Application Server is affected by remote code execution (CVE-2026-9311, CVE-2026-9330)

https://www.ibm.com/support/pages/node/7274733

Vendor Advisories for CVE-2026-9311(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 9× in last 7d / 47× 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 392 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-9311?
CVE-2026-9311 is a critical vulnerability published on June 1, 2026. IBM WebSphere Application Server 9.0, and 8.5 is vulnerable to remote code execution caused by the bypass of security controls.
When was CVE-2026-9311 disclosed?
CVE-2026-9311 was first published in the National Vulnerability Database on June 1, 2026, with the most recent update on July 22, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-9311 actively exploited?
CVE-2026-9311 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 58.1% of all scored CVEs.
What is the CVSS score of CVE-2026-9311?
CVE-2026-9311 has a CVSS v3 base score of 9.0 (NVD).
How do I remediate CVE-2026-9311?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-9311, 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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