CVE-2026-18215

HIGHNVD 8.18.1—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.1 under NVD CVSS v3. EPSS exploit probability: 0.2%, top 92% 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

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

Keycloak provides a way to let users log in using Microsoft accounts while restricting access to a specific organization (tenant). A flaw was discovered where this restriction is ignored when using the token exchange feature. This means an attacker with a valid Microsoft token from a completely different organization could gain access to the Keycloak realm, potentially accessing sensitive data or performing unauthorized actions.

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
9%
KEV
Not listed

Published

July 31, 2026

Last Modified

August 31, 2026

Advisory Details (2)

Auto-updated Jul 31, 2026
Patch available. Sources: redhat.
redhat

2508309 – (CVE-2026-18215) CVE-2026-18215 keycloak-services: keycloak-services: Microsoft external access-token exchange bypasses configured tenant

https://bugzilla.redhat.com/show_bug.cgi?id=2508309
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2026-18215

Vendor Advisories for CVE-2026-18215(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 22× in last 7d / 95× 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 163 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-18215?
CVE-2026-18215 is a high vulnerability published on July 31, 2026. Keycloak provides a way to let users log in using Microsoft accounts while restricting access to a specific organization (tenant). A flaw was discovered where this restriction is ignored when using the token exchange feature. This means an attacker with a valid Microsoft token from a completely…
When was CVE-2026-18215 disclosed?
CVE-2026-18215 was first published in the National Vulnerability Database on July 31, 2026, with the most recent update on August 31, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-18215 actively exploited?
CVE-2026-18215 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 91.5% of all scored CVEs.
What is the CVSS score of CVE-2026-18215?
CVE-2026-18215 has a CVSS v3 base score of 8.1 (NVD).
How do I remediate CVE-2026-18215?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-18215, 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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