CVE-2026-8858

HIGHNVD 8.87.5▼
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-06-22. NVD baseline CVSS 8.8; sources differ by 1.3.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
8.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.8Exploit: NoneExposed: 0

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

IBM WebSphere Application Server and IBM WebSphere Application Server Liberty are vulnerable to remote code execution and denial of service in the WebSphere Web Server Plug-in component. This vulnerability can be exploited when an attacker impersonates the application server and sends crafted responses to the plug-in.

CVSS v3
8.8
EG Score
7.5(medium)
EPSS
17.4%
KEV
Not listed

Published

June 22, 2026

Last Modified

June 24, 2026

Advisory Details (1)

Auto-updated Jun 22, 2026
No patch confirmed yet.
generic

Security Bulletin: IBM i is Affected By Denial of Service, HTTP Request Smuggling, and Remote Code Execution Vulnerabilities in IBM WebSphere Application Server Liberty [CVE-2026-10852, CVE-2026-8858, CVE-2026-9072, CVE-2026-8633, CVE-2026-8620]

https://www.ibm.com/support/pages/node/7277344

Vendor Advisories for CVE-2026-8858(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 37× in last 7d / 77× 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. 2026-07-06 18:56 UTCEG score recompute
  2. 2026-07-06 18:55 UTCGHSA enrichment
  3. 2026-07-06 16:27 UTCEPSS rescore
  4. 2026-07-06 06:19 UTCEG score recompute
  5. 2026-07-06 06:19 UTCGHSA enrichment
  6. 2026-07-06 02:23 UTCEPSS rescore
  7. 2026-07-06 02:23 UTCEPSS rescore
  8. 2026-07-05 18:22 UTCEG score recompute
  9. 2026-07-05 18:21 UTCGHSA enrichment
  10. 2026-07-05 06:44 UTCEG score recompute
  11. 2026-07-05 06:44 UTCGHSA enrichment
  12. 2026-07-05 02:31 UTCEPSS rescore
  13. 2026-07-05 02:30 UTCEPSS rescore
  14. 2026-07-04 19:09 UTCEG score recompute
  15. 2026-07-04 19:09 UTCGHSA enrichment
  16. 2026-07-04 07:32 UTCEG score recompute
  17. 2026-07-04 07:32 UTCGHSA enrichment
  18. 2026-07-04 06:31 UTCEPSS rescore
  19. 2026-07-04 06:31 UTCEPSS rescore
  20. 2026-07-03 19:56 UTCEG score recompute
  21. 2026-07-03 19:56 UTCGHSA enrichment
  22. 2026-07-03 08:23 UTCEG score recompute
  23. 2026-07-03 08:23 UTCGHSA enrichment
  24. 2026-07-02 20:47 UTCEG score recompute
  25. 2026-07-02 20:47 UTCGHSA enrichment
Show 52 more
  1. 2026-07-02 09:11 UTCEG score recompute
  2. 2026-07-02 09:10 UTCGHSA enrichment
  3. 2026-07-01 21:37 UTCEG score recompute
  4. 2026-07-01 21:37 UTCGHSA enrichment
  5. 2026-07-01 15:07 UTCEPSS rescore
  6. 2026-07-01 10:04 UTCEG score recompute
  7. 2026-07-01 10:04 UTCGHSA enrichment
  8. 2026-06-30 23:22 UTCEPSS rescore
  9. 2026-06-30 22:30 UTCEG score recompute
  10. 2026-06-30 22:30 UTCGHSA enrichment
  11. 2026-06-30 10:57 UTCEG score recompute
  12. 2026-06-30 10:57 UTCGHSA enrichment
  13. 2026-06-29 23:12 UTCEG score recompute
  14. 2026-06-29 23:12 UTCGHSA enrichment
  15. 2026-06-29 14:06 UTCEPSS rescore
  16. 2026-06-29 11:40 UTCEG score recompute
  17. 2026-06-29 11:40 UTCGHSA enrichment
  18. 2026-06-29 00:07 UTCEG score recompute
  19. 2026-06-29 00:07 UTCGHSA enrichment
  20. 2026-06-28 14:07 UTCEPSS rescore
  21. 2026-06-28 12:33 UTCEG score recompute
  22. 2026-06-28 12:33 UTCGHSA enrichment
  23. 2026-06-28 04:56 UTCEPSS rescore
  24. 2026-06-28 01:00 UTCEG score recompute
  25. 2026-06-28 01:00 UTCGHSA enrichment
  26. 2026-06-27 13:26 UTCEG score recompute
  27. 2026-06-27 13:26 UTCGHSA enrichment
  28. 2026-06-27 03:08 UTCEPSS rescore
  29. 2026-06-27 01:52 UTCEG score recompute
  30. 2026-06-27 01:52 UTCGHSA enrichment
  31. 2026-06-26 14:19 UTCEG score recompute
  32. 2026-06-26 14:18 UTCGHSA enrichment
  33. 2026-06-26 02:46 UTCEG score recompute
  34. 2026-06-26 02:46 UTCGHSA enrichment
  35. 2026-06-25 15:12 UTCEG score recompute
  36. 2026-06-25 15:12 UTCGHSA enrichment
  37. 2026-06-25 13:50 UTCEPSS rescore
  38. 2026-06-25 03:38 UTCEG score recompute
  39. 2026-06-25 03:38 UTCGHSA enrichment
  40. 2026-06-24 16:04 UTCEG score recompute
  41. 2026-06-24 16:04 UTCGHSA enrichment
  42. 2026-06-24 14:05 UTCEPSS rescore
  43. 2026-06-24 12:00 UTCNVD updateCVSS v3 → 8.8
  44. 2026-06-24 04:31 UTCEG score recompute
  45. 2026-06-24 04:31 UTCGHSA enrichment
  46. 2026-06-23 21:33 UTCEPSS rescore
  47. 2026-06-23 16:58 UTCEG score recompute
  48. 2026-06-23 16:57 UTCGHSA enrichment
  49. 2026-06-23 05:23 UTCEG score recompute
  50. 2026-06-23 05:23 UTCGHSA enrichment
  51. 2026-06-22 17:48 UTCEG score recompute
  52. 2026-06-22 17:45 UTCNVD updatefirst tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-8858?
CVE-2026-8858 is a high vulnerability published on June 22, 2026. IBM WebSphere Application Server and IBM WebSphere Application Server Liberty are vulnerable to remote code execution and denial of service in the WebSphere Web Server Plug-in component. This vulnerability can be exploited when an attacker impersonates the application server and sends crafted…
When was CVE-2026-8858 disclosed?
CVE-2026-8858 was first published in the National Vulnerability Database on June 22, 2026, with the most recent update on June 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-8858 actively exploited?
CVE-2026-8858 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 17.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-8858?
CVE-2026-8858 has a CVSS v3 base score of 8.8 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 7.5.
How do I remediate CVE-2026-8858?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-8858, 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-2026-8858

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