GHSA-p3v8-fm5p-v84h
Keycloak has an Improper Verification of Cryptographic Signature issue
Details
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.
Are you affected?
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Affected packages
0 No fixed version published yet for org.keycloak:keycloak-services (maven). Pin to a known-safe version or switch to an alternative.
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-9793 [ADVISORY]
- https://github.com/keycloak/keycloak/issues/49429 [WEB]
- https://access.redhat.com/errata/RHSA-2026:50846 [WEB]
- https://access.redhat.com/errata/RHSA-2026:50847 [WEB]
- https://access.redhat.com/errata/RHSA-2026:50848 [WEB]
- https://access.redhat.com/errata/RHSA-2026:50849 [WEB]
- https://access.redhat.com/security/cve/CVE-2026-9793 [WEB]
- https://bugzilla.redhat.com/show_bug.cgi?id=2482460 [WEB]
- https://github.com/keycloak/keycloak [PACKAGE]