CVE-2026-37979

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

Score 6.5 from GitHub Security Advisory published 2026-05-19. a secondary CVSS source baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 6.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

A flaw was found in Keycloak. This access control vulnerability in Keycloak's OpenID Connect (OIDC) token introspection endpoint allows a confidential client to bypass audience restrictions. An attacker-controlled client with valid credentials can retrieve sensitive token claims intended for other resource servers, compromising the confidentiality of lightweight access tokens. This issue can be exploited remotely by any confidential client in the realm with valid credentials.

CVSS v3
6.5
EG Score
6.5MEDIUMmedium confidence
EG Risk
29
EG Risk 29/100

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
Severity65% × 45%
Exploitation0% × 40%
Automatability0% × 15%
EPSS PROB
0.4%
EPSS %ILE
33rd
KEV
Not listed

Published

May 19, 2026

Last Modified

June 3, 2026

Advisory Details (4)

Auto-updated Jun 13, 2026
Patch available. Sources: redhat.
redhat

2455328 – (CVE-2026-37979) CVE-2026-37979 keycloak: Keycloak: Information disclosure via OIDC token introspection endpoint audience bypass

https://bugzilla.redhat.com/show_bug.cgi?id=2455328
redhatMentions a patch (unverified)

cve-details

https://access.redhat.com/security/cve/CVE-2026-37979
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-2026-37979(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 223 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 02:03 UTCEG score recompute
  33. 2026-08-15 02:03 UTCVendor advisory
  34. 2026-08-15 01:30 UTCEPSS rescore
  35. 2026-08-14 02:08 UTCEG score recompute
  36. 2026-08-14 02:08 UTCVendor advisory
  37. 2026-08-13 22:00 UTCEPSS rescore
  38. 2026-08-13 01:12 UTCEG score recompute
  39. 2026-08-13 01:12 UTCVendor advisory
  40. 2026-08-12 13:51 UTCEPSS rescore
  41. 2026-08-12 01:18 UTCEG score recompute
  42. 2026-08-12 01:18 UTCVendor advisory
  43. 2026-08-11 13:43 UTCEPSS rescore
  44. 2026-08-11 01:24 UTCEG score recompute
  45. 2026-08-11 01:24 UTCVendor advisory
  46. 2026-08-11 00:00 UTCEPSS rescore
  47. 2026-08-10 01:31 UTCEG score recompute
  48. 2026-08-10 01:31 UTCVendor advisory
  49. 2026-08-09 13:46 UTCEPSS rescore
  50. 2026-08-09 01:37 UTCEG score recompute
  51. 2026-08-09 01:37 UTCVendor advisory
  52. 2026-08-08 16:37 UTCEPSS rescore
  53. 2026-08-07 21:11 UTCEG score recompute
  54. 2026-08-07 21:11 UTCVendor advisory
  55. 2026-08-06 21:17 UTCEG score recompute
  56. 2026-08-06 21:17 UTCVendor advisory
  57. 2026-08-06 13:46 UTCEPSS rescore
  58. 2026-08-05 21:23 UTCEG score recompute
  59. 2026-08-05 21:23 UTCVendor advisory
  60. 2026-08-05 19:17 UTCEPSS rescore
  61. 2026-08-04 15:10 UTCEPSS rescore
  62. 2026-08-04 10:38 UTCEPSS rescore
  63. 2026-08-03 18:48 UTCEG score recompute
  64. 2026-08-03 18:48 UTCVendor advisory
  65. 2026-08-03 10:36 UTCEPSS rescore
  66. 2026-08-02 17:57 UTCEG score recompute
  67. 2026-08-02 17:57 UTCVendor advisory
  68. 2026-08-02 02:27 UTCEPSS rescore
  69. 2026-08-01 18:03 UTCEG score recompute
  70. 2026-08-01 18:03 UTCVendor advisory
  71. 2026-08-01 04:16 UTCEPSS rescore
  72. 2026-07-30 16:28 UTCEPSS rescore
  73. 2026-07-30 01:30 UTCEPSS rescore
  74. 2026-07-27 14:13 UTCEPSS rescore
  75. 2026-07-26 14:54 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2026-37979?
CVE-2026-37979 is a medium vulnerability published on May 19, 2026. A flaw was found in Keycloak. This access control vulnerability in Keycloak's OpenID Connect (OIDC) token introspection endpoint allows a confidential client to bypass audience restrictions. An attacker-controlled client with valid credentials can retrieve sensitive token claims intended for other…
When was CVE-2026-37979 disclosed?
CVE-2026-37979 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-2026-37979 actively exploited?
CVE-2026-37979 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (33rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-37979?
CVE-2026-37979 has a CVSS base score of 6.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-37979?
A fix for CVE-2026-37979 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-37979 are linked in the Vendor Advisories panel on this page.

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