OIDC Protocol Flaw in Keycloak Identity Management Solution
CVE-2026-93999

4.2MEDIUM

Key Information:

Vendor

Red Hat
Status
Red Hat Build Of Keycloak
Red Hat Single Sign-on 7
Vendor
CVE Published:
19 September 2026

What is CVE-2026-93999?

A vulnerability exists in the OIDC protocol implementation of Keycloak, an open-source identity and access management solution. During the token refresh process, the server mistakenly restores requested audiences from stored client IDs without verifying if the target audience client is active. This oversight allows applications with an existing refresh token to continue generating valid access tokens for clients that have been disabled, resulting in potential circumvention of administrative access controls for resource servers relying on offline JWT validation.

References

https://access.redhat.com/security/cve/CVE-2026-93999
vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2537165
issue-trackingx_refsource_REDHAT

CVSS V3.1

Score:
4.2
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Red Hat would like to thank Moritz Theile (@Moritz-cmd) for reporting this issue.
.