CVE-2026-9087

HIGHNVD 8.18.1—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.1 under NVD CVSS v3. EPSS exploit probability: 0.3%, top 76% of all CVEs by exploit prediction. GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
8.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.1Exploit: None knownExposed: 0

A fix is available — apply it.

A flaw was found in Keycloak. The cross-session verification proof is keyed only by (local userId, idpAlias) and is not bound to the upstream identity that was actually verified, so a second upstream account on the same IdP can consume it and get linked to the victim's local account.

CVSS v3
8.1
EG Score
8.1(medium)
EG Risk
37(Track)
EG Risk 37/100SSVC: 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
Severity81% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
24%
KEV
Not listed

Published

May 20, 2026

Last Modified

August 3, 2026

Advisory Details (2)

Auto-updated Jun 10, 2026
Patch available. Sources: redhat.
redhat

2480172 – (CVE-2026-9087) CVE-2026-9087 keycloak: Cross-Session Email Verification Proof Not Bound to Upstream Identity in First-Broker-Login

https://bugzilla.redhat.com/show_bug.cgi?id=2480172
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2026-9087

Vendor Advisories for CVE-2026-9087(5)

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

Patch Availability(3)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatrhbk/keycloak-rhel92026-06-25redhat
redhatrhbk/keycloak-rhel9-operator:26.4-192026-06-25redhat
redhatrhbk/keycloak-rhel9-operator:26.6-62026-06-10redhat

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.

Affected Packages

(1 across 1 ecosystem)
Maven(1)
PackageVulnerable rangeFixed inDependents
org.keycloak:keycloak-services1.0-alpha-1 ... 9.0.3 (227 versions)26.6.3—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 17× in last 7d / 76× 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 164 total refreshes for this CVE.

  1. 2026-08-20 22:56 UTCEPSS rescore
  2. 2026-08-20 18:54 UTCEG score recompute
  3. 2026-08-20 18:54 UTCVendor advisory
  4. 2026-08-19 17:04 UTCEPSS rescore
  5. 2026-08-18 13:49 UTCEPSS rescore
  6. 2026-08-17 13:47 UTCEPSS rescore
  7. 2026-08-17 09:52 UTCVendor advisory
  8. 2026-08-16 16:54 UTCEG score recompute
  9. 2026-08-16 16:54 UTCVendor advisory
  10. 2026-08-16 14:56 UTCEPSS rescore
  11. 2026-08-16 14:56 UTCEPSS rescore
  12. 2026-08-16 03:29 UTCEG score recompute
  13. 2026-08-16 03:29 UTCVendor advisory
  14. 2026-08-16 02:15 UTCEPSS rescore
  15. 2026-08-15 01:31 UTCEPSS rescore
  16. 2026-08-15 00:43 UTCVendor advisory
  17. 2026-08-14 13:22 UTCVendor advisory
  18. 2026-08-14 02:01 UTCEG score recompute
  19. 2026-08-14 02:01 UTCVendor advisory
  20. 2026-08-13 22:00 UTCEPSS rescore
  21. 2026-08-13 01:36 UTCVendor advisory
  22. 2026-08-12 14:15 UTCEG score recompute
  23. 2026-08-12 14:15 UTCVendor advisory
  24. 2026-08-12 13:51 UTCEPSS rescore
  25. 2026-08-12 01:12 UTCVendor advisory
Show 75 more
  1. 2026-08-11 13:51 UTCEG score recompute
  2. 2026-08-11 13:51 UTCVendor advisory
  3. 2026-08-11 13:43 UTCEPSS rescore
  4. 2026-08-11 00:35 UTCEG score recompute
  5. 2026-08-11 00:35 UTCVendor advisory
  6. 2026-08-11 00:00 UTCEPSS rescore
  7. 2026-08-10 11:37 UTCVendor advisory
  8. 2026-08-10 00:13 UTCEG score recompute
  9. 2026-08-10 00:13 UTCVendor advisory
  10. 2026-08-09 13:47 UTCEPSS rescore
  11. 2026-08-09 12:53 UTCVendor advisory
  12. 2026-08-09 01:31 UTCVendor advisory
  13. 2026-08-08 06:08 UTCVendor advisory
  14. 2026-08-07 18:46 UTCEG score recompute
  15. 2026-08-07 18:46 UTCVendor advisory
  16. 2026-08-07 16:30 UTCEPSS rescore
  17. 2026-08-07 07:21 UTCVendor advisory
  18. 2026-08-06 19:58 UTCEG score recompute
  19. 2026-08-06 19:58 UTCVendor advisory
  20. 2026-08-06 13:47 UTCEPSS rescore
  21. 2026-08-06 08:37 UTCVendor advisory
  22. 2026-08-05 21:16 UTCEG score recompute
  23. 2026-08-05 21:16 UTCVendor advisory
  24. 2026-08-05 19:17 UTCEPSS rescore
  25. 2026-08-05 19:17 UTCEPSS rescore
  26. 2026-08-04 15:10 UTCEPSS rescore
  27. 2026-08-04 10:39 UTCEPSS rescore
  28. 2026-08-03 22:49 UTCVendor advisory
  29. 2026-08-03 11:28 UTCEG score recompute
  30. 2026-08-03 11:28 UTCVendor advisory
  31. 2026-08-03 10:36 UTCEPSS rescore
  32. 2026-08-03 03:43 UTCVendor advisory
  33. 2026-08-02 16:22 UTCVendor advisory
  34. 2026-08-02 05:01 UTCEG score recompute
  35. 2026-08-02 05:01 UTCVendor advisory
  36. 2026-08-02 02:27 UTCEPSS rescore
  37. 2026-08-01 17:39 UTCEG score recompute
  38. 2026-08-01 17:39 UTCVendor advisory
  39. 2026-08-01 04:16 UTCEPSS rescore
  40. 2026-07-30 16:28 UTCEPSS rescore
  41. 2026-07-30 01:30 UTCEPSS rescore
  42. 2026-07-28 15:37 UTCEPSS rescore
  43. 2026-07-27 14:14 UTCEPSS rescore
  44. 2026-07-26 14:54 UTCEPSS rescore
  45. 2026-07-26 08:14 UTCEG score recompute
  46. 2026-07-26 08:14 UTCVendor advisory
  47. 2026-07-25 14:18 UTCEPSS rescore
  48. 2026-07-24 14:18 UTCEPSS rescore
  49. 2026-07-23 14:18 UTCEPSS rescore
  50. 2026-07-23 03:23 UTCEG score recompute▲ 1.70
  51. 2026-07-22 14:08 UTCEPSS rescore
  52. 2026-07-21 15:25 UTCEPSS rescore
  53. 2026-07-21 15:25 UTCEPSS rescore
  54. 2026-07-20 17:08 UTCEPSS rescore
  55. 2026-07-19 14:31 UTCEPSS rescore
  56. 2026-07-19 02:29 UTCEPSS rescore
  57. 2026-07-18 10:04 UTCEPSS rescore
  58. 2026-07-16 17:03 UTCEPSS rescore
  59. 2026-07-15 16:57 UTCEPSS rescore
  60. 2026-07-15 02:00 UTCEPSS rescore
  61. 2026-07-13 22:31 UTCEPSS rescore
  62. 2026-07-13 06:13 UTCEPSS rescore
  63. 2026-07-12 05:46 UTCEPSS rescore
  64. 2026-07-11 08:27 UTCEPSS rescore
  65. 2026-07-09 19:10 UTCEPSS rescore
  66. 2026-07-08 15:16 UTCEPSS rescore
  67. 2026-07-07 13:46 UTCEPSS rescore
  68. 2026-07-06 16:27 UTCEPSS rescore
  69. 2026-07-06 02:23 UTCEPSS rescore
  70. 2026-07-05 02:31 UTCEPSS rescore
  71. 2026-07-05 02:30 UTCEPSS rescore
  72. 2026-07-04 06:31 UTCEPSS rescore
  73. 2026-07-04 06:31 UTCEPSS rescore
  74. 2026-07-01 15:07 UTCEPSS rescore
  75. 2026-06-30 23:22 UTCEPSS rescore

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-9087?
CVE-2026-9087 is a high vulnerability published on May 20, 2026. A flaw was found in Keycloak. The cross-session verification proof is keyed only by (local userId, idpAlias) and is not bound to the upstream identity that was actually verified, so a second upstream account on the same IdP can consume it and get linked to the victim's local account.
When was CVE-2026-9087 disclosed?
CVE-2026-9087 was first published in the National Vulnerability Database on May 20, 2026, with the most recent update on August 3, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-9087 actively exploited?
CVE-2026-9087 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 76.0% of all scored CVEs.
What is the CVSS score of CVE-2026-9087?
CVE-2026-9087 has a CVSS v3 base score of 8.1 (NVD).
How do I remediate CVE-2026-9087?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-9087, 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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