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TI-2026-10185 Aliases CVE-2026-11800GHSA-gqj5-2xp5-3qmpGHSA-j97h-3f8r-mrjr

Org.keycloak:keycloak-services: keycloak: authentication bypass via jwt algorithm confusion

Priority LOW 37CWE-347Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · None
Fix status
Partial Red Hat: 2 fixed, 1 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-347.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.003 22nd percentileScored 2026-11-07
Fix Partial org.keycloak:keycloak-services (Maven): 26.6.4Red Hat: 2 advisoriesRed Hat: 2 fixed, 1 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Red HatRed Hat build of Keycloak 26.6—26.6.4-2Patch availableCNA
Red HatRed Hat build of Keycloak 26.6—26.6-8Patch availableCNA
Red HatRed Hat build of Keycloak 26.6—26.6-8Patch availableCNA
Red HatRed Hat build of Keycloak 26.6.4——Not affectedCNA
Red HatRed Hat Build of Keycloak——No fix listedCNA
Red HatRed Hat Build of Keycloak——Not affectedCNA
Red HatRed Hat Data Grid 8——Not affectedCNA
Red HatRed Hat JBoss Enterprise Application Platform Expansion Pack——Not affectedCNA
Red HatRed Hat Single Sign-On 7——Not affectedCNA
—org.keycloak:keycloak-services (Maven)before 26.6.426.6.4Patch availableGHSA-j97h-3f8r-mrjr
  • Red Hat build of Keycloak 26.6 VendorRed Hat Affected — Fixed in 26.6.4-2 Patch available CNA
  • Red Hat build of Keycloak 26.6 VendorRed Hat Affected — Fixed in 26.6-8 Patch available CNA
  • Red Hat build of Keycloak 26.6 VendorRed Hat Affected — Fixed in 26.6-8 Patch available CNA
  • Red Hat build of Keycloak 26.6.4 VendorRed Hat Affected — Fixed in — Not affected CNA
  • Red Hat Build of Keycloak VendorRed Hat Affected — Fixed in — No fix listed CNA
  • Red Hat Build of Keycloak VendorRed Hat Affected — Fixed in — Not affected CNA
  • Red Hat Data Grid 8 VendorRed Hat Affected — Fixed in — Not affected CNA
  • Red Hat JBoss Enterprise Application Platform Expansion Pack VendorRed Hat Affected — Fixed in — Not affected CNA
  • Red Hat Single Sign-On 7 VendorRed Hat Affected — Fixed in — Not affected CNA
  • org.keycloak:keycloak-services (Maven) Vendor— Affected before 26.6.4 Fixed in 26.6.4 Patch available GHSA-j97h-3f8r-mrjr

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:redhat:build_of_keycloak:*:*:*:*:*:*:*:*26.6 to before 26.6.4VulnerableRed Hat
  • cpe:2.3:a:redhat:build_of_keycloak:*:*:*:*:*:*:*:* Versions 26.6 to before 26.6.4 Vulnerable ·Red Hat

Remediation

  • Fix · GHSA-j97h-3f8r-mrjr org.keycloak:keycloak-services (Maven) Fixed in 26.6.4 Advisory →

Red Hat 2 advisories

  • RHSA-2026:30084 Released 2026-06-25 · Red Hat rating Important
    Red Hat build of Keycloak 26.6.4 Images Security Update
    • Red Hat build of Keycloak 26.6 rhbk/keycloak-operator-bundle, rhbk/keycloak-rhel9, rhbk/keycloak-rhel9-operator
  • RHSA-2026:30083 Released 2026-06-25 · Red Hat rating Important
    Red Hat build of Keycloak 26.6.4 Security Update
    • Red Hat build of Keycloak 26.6.4

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Build of KeycloakAffectedNo fix yet
Red Hat build of Keycloak 26.6Fixed RHSA-2026:30084
Red Hat build of Keycloak 26.6.4Fixed RHSA-2026:30083
Not affected: 4 products
  • Red Hat Build of Keycloak
  • Red Hat Data Grid 8
  • Red Hat JBoss Enterprise Application Platform Expansion Pack
  • Red Hat Single Sign-On 7

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-11800
  2. 2026-10-03 Alias added: GHSA-gqj5-2xp5-3qmp
  3. 2026-11-03 Alias added: GHSA-j97h-3f8r-mrjr
  4. 2026-11-03 Fix available: Maven/org.keycloak:[email protected] · GHSA-j97h-3f8r-mrjr
  5. 2026-11-03 CVSS score added · GHSA-j97h-3f8r-mrjr
  6. 2026-11-03 Weakness changed · GHSA-j97h-3f8r-mrjr
  7. 2026-11-03 13 new references · GHSA-j97h-3f8r-mrjr

References

Advisory 6

Other 7

  • TI-2026-02223 Keycloak: keycloak: unauthorized authentication via disabled saml identity provider CVSS 3.1HIGH 8.1
  • TI-2024-01049 Keycloak: path transversal in redirection validation CVSS 3.1HIGH 8.1
  • TI-2026-13740 Keycloak-services: keycloak-services: saml idp-initiated broker login bypasses link-only restriction CVSS 3.1CRITICAL 9.8
  • TI-2026-13741 Keycloak-services: keycloak-services: saml broker metadata import disables response signature validation CVSS 3.1CRITICAL 9.1
  • TI-2026-13106 Keycloak-services: keycloak-services: dcr protocol mapper type-swap policy bypass allows privilege escalation CVSS 3.1HIGH 8.8
  • TI-2026-02631 Authentication bypass in Red Hat build of Keycloak 26.2 CVSS 3.1HIGH 8.8
See all 110 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences