CVE-2026-11800

HIGHPre-NVD 8.18.1—
EchelonGraph scoreHIGH confidence

Score 8.1 from GitHub Security Advisory (severity: HIGH) published 2026-06-26. a secondary CVSS source baseline 8.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
8.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.1Exploit: NoneExposed: 0

A fix is available — apply it.

A flaw was found in Keycloak. This JWT algorithm confusion vulnerability in the JWT Authorization Grant flow allows an attacker with valid client credentials to bypass signature verification. By forging an assertion, the attacker can create unauthorized access tokens. This enables the attacker to impersonate any federated user linked to the affected Identity Provider, leading to unauthorized access and potential privilege escalation.

CVSS v3
8.1
EG Score
8.1(high)
EPSS
7.9%
KEV
Not listed

Published

June 25, 2026

Last Modified

July 15, 2026

Advisory Details (4)

Auto-updated Jun 25, 2026
Patch available. Sources: redhat.
redhat

2487006 – (CVE-2026-11800) CVE-2026-11800 org.keycloak:keycloak-services: Keycloak: Authentication bypass via JWT algorithm confusion

https://bugzilla.redhat.com/show_bug.cgi?id=2487006
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2026-11800
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:30084
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:30083

Vendor Advisories for CVE-2026-11800(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
redhatpatch2026-06-25redhat
redhatrhbk/keycloak-rhel9-operator:26.6-82026-06-25redhat

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.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 13× in last 7d / 117× 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 117 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-11800?
CVE-2026-11800 is a high vulnerability published on June 25, 2026. A flaw was found in Keycloak. This JWT algorithm confusion vulnerability in the JWT Authorization Grant flow allows an attacker with valid client credentials to bypass signature verification. By forging an assertion, the attacker can create unauthorized access tokens. This enables the attacker to…
When was CVE-2026-11800 disclosed?
CVE-2026-11800 was first published in the National Vulnerability Database on June 25, 2026, with the most recent update on July 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-11800 actively exploited?
CVE-2026-11800 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 7.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-11800?
CVE-2026-11800 has a CVSS v3 base score of 8.1 (NVD).
How do I remediate CVE-2026-11800?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-11800, 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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