Flaw in Keycloak's OIDC Introspection Feature Allows Unauthorized Access
CVE-2026-8922

5.4MEDIUM

Key Information:

Vendor

Red Hat
Status
Red Hat Build Of Keycloak 26.4
Red Hat Build Of Keycloak 26.4.13
Red Hat Build Of Keycloak 26.6
Red Hat Build Of Keycloak 26.6.3
Vendor
CVE Published:
19 May 2026

What is CVE-2026-8922?

A flaw was identified in Keycloak that impacts the OpenID Connect (OIDC) Introspection capability. When realm-level and client-level 'notBefore' revocation policies are set, the OIDC feature improperly fails to enforce the realm-level policy. This oversight allows tokens, which should have been invalidated, to remain operational. Consequently, this can lead to unauthorized access or enable ongoing session validity, thereby compromising the security of identity and access management systems that depend on Keycloak.

Affected Version(s)

Red Hat build of Keycloak 26.4 26.4.13-1

Red Hat build of Keycloak 26.4 26.4-19

Red Hat build of Keycloak 26.4 26.4-19

References

https://access.redhat.com/errata/RHSA-2026:25097
vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:25098
vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:30049
vendor-advisoryx_refsource_REDHAT

CVSS V3.1

Score:
5.4
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Red Hat would like to thank Joy Gilbert and Reynaldo Immanuel for reporting this issue.
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