CVE-2026-93998
Keycloak-core: keycloak-core: saml adapter does not bind signed assertions to the configured identity provider issuer
What happened?
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.
Affected software and versions
| Software | Version information | Fixed version |
|---|---|---|
| keycloak-rhel9-containerRed Hat | unaffected: 26.4-29 to < * | See vendor advisory |
| keycloak-rhel9-operator-bundle-containerRed Hat | unaffected: 26.4.17-2 to < * | See vendor advisory |
| keycloak-rhel9-operator-containerRed Hat | unaffected: 26.4-30 to < * | See vendor advisory |
| keycloak-coreRed Hat | Default status: unaffected | See vendor advisory |
| keycloak/rhbk-openshift-rhel9Red Hat | Default status: unaffected | See vendor advisory |
| keycloak/rhbk-rhel9-operatorRed Hat | Default status: unaffected | See vendor advisory |
| rhbk/keycloak-rhel9Red Hat | Default status: unaffected | See vendor advisory |
| rhbk/keycloak-rhel9-operatorRed Hat | Default status: unaffected | See vendor advisory |
| keycloak-coreRed Hat | Default status: unaffected | See vendor advisory |
| keycloak-coreRed Hat | Default status: unaffected | See vendor advisory |
| jboss-eap-7/eap74-els-openjdk11-openshift-rhel8Red Hat | Default status: unaffected | See vendor advisory |
| jboss-eap-7/eap74-els-openjdk17-openshift-rhel8Red Hat | Default status: unaffected | See vendor advisory |
| jboss-eap-7/eap74-els-openjdk8-openshift-rhel8Red Hat | Default status: unaffected | See vendor advisory |
| keycloak-coreRed Hat | Default status: unaffected | See vendor advisory |
| keycloak-coreRed Hat | Default status: unaffected | See vendor advisory |
| candlepinRed Hat | Default status: unaffected | See vendor advisory |
| keycloak-coreRed Hat | Default status: unaffected | See vendor advisory |
Version information comes from the source record and can include unaffected products and exceptions. Distribution packages may contain backported fixes: an older upstream version alone does not prove a server is affected.
Is it being exploited?
This CVE was not listed in the CISA catalogue at our last retrieval. This does not establish that exploitation is absent.
How to respond
- Confirm the product, installed package version, and any configuration requirements in the vendor advisory.
- Follow the vendor’s remediation or workaround guidance in the references below. Structured fixed-version data is unavailable here; the publisher’s description may include a fix or workaround.
- Restart affected services if required, then verify the running version. Known exploitation may warrant investigation as well as patching.