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
4.9EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 4.9Exploit: None knownExposed services: Not assessed

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
4.9MEDIUMmedium confidence
EG Risk
22
EG Risk 22/100

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%
EPSS PROB
0.5%
EPSS %ILE
37th
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
redhatMentions a patch (unverified)

cve-details

https://access.redhat.com/security/cve/CVE-2026-37978
redhatMentions a patch (unverified)
https://access.redhat.com/errata/RHSA-2026:19597
redhatMentions a patch (unverified)
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 / EcosystemFix (by version range) / 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 rangeFix by version rangeDependents
org.keycloak:keycloak-services1.0-alpha-1 ... 9.0.3 (226 versions)
  • every version up to 26.6.2: fixed in 26.6.2
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 6× in last 7d / 24× 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 217 total refreshes for this CVE.

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

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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 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 0.5% probability of exploitation in the next 30 days (37th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-37978?
CVE-2026-37978 has a CVSS base score of 4.9 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-37978?
A fix for CVE-2026-37978 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-37978 are linked in the Vendor Advisories panel on this page.

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