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TI-2026-28104 Aliases CVE-2026-37979GHSA-4x37-hw65-52w8

Keycloak: keycloak: information disclosure via oidc token introspection endpoint audience bypass

Priority LOW 29CWE-639Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
High · None · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-639.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00366 30th percentileScored 2026-11-07
Fix Fixed org.keycloak:keycloak-services (Maven): 26.6.2Red Hat: 2 advisories

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

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 26.4—26.4.12-1Patch availableCNA
Red HatRed Hat build of Keycloak 26.4—26.4-17Patch availableCNA
Red HatRed Hat build of Keycloak 26.4—26.4-17Patch availableCNA
Red HatRed Hat build of Keycloak 26.4.12——Not affectedCNA
—org.keycloak:keycloak-services (Maven)before 26.6.226.6.2Patch availableGHSA-4x37-hw65-52w8
  • Red Hat build of Keycloak 26.4 VendorRed Hat Affected — Fixed in 26.4.12-1 Patch available CNA
  • Red Hat build of Keycloak 26.4 VendorRed Hat Affected — Fixed in 26.4-17 Patch available CNA
  • Red Hat build of Keycloak 26.4 VendorRed Hat Affected — Fixed in 26.4-17 Patch available CNA
  • Red Hat build of Keycloak 26.4.12 VendorRed Hat Affected — Fixed in — Not affected CNA
  • org.keycloak:keycloak-services (Maven) Vendor— Affected before 26.6.2 Fixed in 26.6.2 Patch available GHSA-4x37-hw65-52w8

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:redhat:build_of_keycloak:*:*:*:*:*:*:*:*26.4 to before 26.4.12VulnerableRed Hat
  • cpe:2.3:a:redhat:build_of_keycloak:*:*:*:*:*:*:*:* Versions 26.4 to before 26.4.12 Vulnerable ·Red Hat

Remediation

  • Fix · GHSA-4x37-hw65-52w8 org.keycloak:keycloak-services (Maven) Fixed in 26.6.2 Advisory →

Red Hat 2 advisories

  • RHSA-2026:19597 Released 2026-05-20 · Red Hat rating Important
    Red Hat build of Keycloak 26.4.12 Images Security Update
    • Red Hat build of Keycloak 26.4 rhbk/keycloak-operator-bundle, rhbk/keycloak-rhel9, rhbk/keycloak-rhel9-operator
  • RHSA-2026:19596 Released 2026-05-20 · Red Hat rating Important
    Red Hat build of Keycloak 26.4.12 Security Update
    • Red Hat build of Keycloak 26.4.12

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat build of Keycloak 26.4Fixed RHSA-2026:19597
Red Hat build of Keycloak 26.4.12Fixed RHSA-2026:19596

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-37979
  2. 2026-10-03 Alias added: GHSA-4x37-hw65-52w8
  3. 2026-10-29 Weakness changed · CNA

References

Advisory 5

Other 3

  • 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