CVE-2026-93998High· 7.4▾ TwilightA flaw was found in the SAML adapter component of Keycloak, which is used to secure applications with SAML-based authentication. The adapter fails to verify that the issuer of a signed SAML assertion matches the expected identity provide…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 40.7 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
A flaw was found in the SAML adapter component of Keycloak, which is used to secure applications with SAML-based authentication. The adapter fails to verify that the issuer of a signed SAML assertion matches the expected identity provider configured for the application. If multiple identity providers share the same trusted signing key, an attacker who controls one of those providers can create a validly signed assertion to log into the application as any user, potentially gaining full administrative control.
keycloak-corekeycloak-core (all versions)keycloak/rhbk-openshift-rhel9 (all versions)keycloak/rhbk-rhel9-operator (all versions)rhbk/keycloak-rhel9 (all versions)rhbk/keycloak-rhel9-operator (all versions)keycloak-corejboss-eap-7/eap74-els-openjdk11-openshift-rhel8jboss-eap-7/eap74-els-openjdk17-openshift-rhel8jboss-eap-7/eap74-els-openjdk8-openshift-rhel8keycloak-corekeycloak-corecandlepinkeycloak-coreRefer to the linked advisories for vendor-supplied fixes and affected version ranges.
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Connected by shared product, vendor, weakness, or advisory.
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