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
Trending — 3 sources updated this week
4.9EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 4.9Exploit: None knownExposed: 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)
EG Risk
22(Track)
EG Risk 22/100SSVC: 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
Severity49% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
33%
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 11× in last 7d / 54× 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 180 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

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 0% probability of exploitation in the next 30 days, which ranks it in the top 67.4% of all scored CVEs.
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.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-37978

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