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GHSA-p3v8-fm5p-v84h

Keycloak has an Improper Verification of Cryptographic Signature issue

Source: GitHub Advisory Database (reviewed) Moderate CVE-2026-9793

Packages

EcosystemPackageAffectedFixed in
Maven org.keycloak:keycloak-services <= 26.6.4 no fix listed

Details

As written in the advisory (Markdown source, shown as plain text).

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.

References

External links from the advisory. They lead to third-party sites.