Description (CNA)
A flaw was found in Keycloak. When a JSON Web Encryption (JWE) encrypted request object is submitted, Keycloak may incorrectly process unsigned claims if the decrypted content is raw JSON, bypassing the configured signature policy. This allows a remote attacker to submit unauthorized claims, leading to a compromise of data integrity within the OpenID Connect (OIDC) authorization flow. While a redirect URI allowlist acts as a compensating control, this vulnerability violates OIDC Core and Financial-grade API (FAPI) signing requirements.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Red Hat / Red Hat build of Keycloak 26.4 | unaffected 26.4.14-1 before * |
| Red Hat / Red Hat build of Keycloak 26.4 | unaffected 26.4-22 before * |
| Red Hat / Red Hat build of Keycloak 26.4 | unaffected 26.4-22 before * |
| Red Hat / Red Hat build of Keycloak 26.4.14 | unaffected |
| Red Hat / Red Hat build of Keycloak 26.6 | unaffected 26.6.5-1 before * |
| Red Hat / Red Hat build of Keycloak 26.6 | unaffected 26.6-11 before * |
| Red Hat / Red Hat build of Keycloak 26.6 | unaffected 26.6-11 before * |
| Red Hat / Red Hat build of Keycloak 26.6.5 | unaffected |
CWE
CWE-347
References
- https://access.redhat.com/errata/RHSA-2026:50846
- https://access.redhat.com/errata/RHSA-2026:50847
- https://access.redhat.com/errata/RHSA-2026:50848
- https://access.redhat.com/errata/RHSA-2026:50849
- https://access.redhat.com/security/cve/CVE-2026-9793
- https://bugzilla.redhat.com/show_bug.cgi?id=2482460
ADP enrichment
No English description supplied.
No references supplied.