{"id":"CVE-2026-9793","title":"A flaw was found in Keycloak","summary":"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 …","severity":"medium","cvss":5.9,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N","cwe":["CWE-347"],"vendor":"redhat","product":"build_of_keycloak","affected":["build_of_keycloak"],"published":"2026-05-28","updated":"2026-08-05","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-9793","references":[{"url":"https://access.redhat.com/errata/RHSA-2026:50846","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:50847","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:50848","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:50849","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/security/cve/CVE-2026-9793","label":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2482460","label":"secalert@redhat.com"}],"tags":["nvd"],"epss":0.00163,"epssPercentile":0.05984,"ingestedAt":"2026-08-06T05:56:21.614Z","slug":"CVE-2026-9793","body":"## Overview\n\nA 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.\n\n## Affected\n\n- `build_of_keycloak`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":32,"depthScoreParts":{"impact":32.5,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}