CVE-2026-37978

MEDIUMPre-NVD 4.94.9—
EchelonGraph scoreMEDIUM confidence

Score 4.9 from GitHub Security Advisory published 2026-05-19. a secondary CVSS source baseline 4.9; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
4.9
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 4.9Exploit: NoneExposed: 0

A fix is available — apply it.

A flaw was found in Keycloak. A low-privilege administrator with the 'view-clients' role can exploit this by invoking the 'evaluate-scopes' Admin API endpoints with an arbitrary user ID (userId) parameter. This vulnerability allows for cross-role personally identifiable information (PII) leakage, enabling unauthorized visibility into user identities and authorizations across the realm. Exploitation is possible remotely via network access to the Admin API.

CVSS v3
4.9
EG Score
4.9(medium)
EPSS
31.9%
KEV
Not listed

Published

May 19, 2026

Last Modified

June 3, 2026

Advisory Details (4)

Auto-updated Jun 14, 2026
Patch available. Sources: redhat.
redhat

2455327 – (CVE-2026-37978) CVE-2026-37978 keycloak: org.keycloak.services: Keycloak: Information Disclosure via evaluate-scopes Admin API

https://bugzilla.redhat.com/show_bug.cgi?id=2455327
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2026-37978
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:19597
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:19596

Vendor Advisories for CVE-2026-37978(3)

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

Patch Availability(2)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatrhbk/keycloak-rhel9-operator:26.4-172026-05-20redhat
redhatrhbk/keycloak-rhel92026-05-20redhat

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 (226 versions)26.6.2—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 56× 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 124 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-37978?
CVE-2026-37978 is a medium vulnerability published on May 19, 2026. A flaw was found in Keycloak. A low-privilege administrator with the 'view-clients' role can exploit this by invoking the 'evaluate-scopes' Admin API endpoints with an arbitrary user ID (userId) parameter. This vulnerability allows for cross-role personally identifiable information (PII) leakage,…
When was CVE-2026-37978 disclosed?
CVE-2026-37978 was first published in the National Vulnerability Database on May 19, 2026, with the most recent update on June 3, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-37978 actively exploited?
CVE-2026-37978 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 31.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-37978?
CVE-2026-37978 has a CVSS v3 base score of 4.9 (NVD).
How do I remediate CVE-2026-37978?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-37978, 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.

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