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
8%
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 36× in last 7d / 154× 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 270 total refreshes for this CVE.

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

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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 0% probability of exploitation in the next 30 days, which ranks it in the top 92.0% 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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