CVE-2026-11800

HIGHPre-NVD 8.18.1—
EchelonGraph scoreMEDIUM 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 — 4 sources updated this week
8.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.1Exploit: None knownExposed: 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(medium)
EG Risk
37(Track)
EG Risk 37/100SSVC: 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
Severity81% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
23%
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 11× in last 7d / 61× 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 325 total refreshes for this CVE.

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

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 0% probability of exploitation in the next 30 days, which ranks it in the top 77.1% of all scored CVEs.
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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