Improper Handling of Extra Parameters Affecting org.keycloak:keycloak-saml-core package, versions [0,]
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JAVA-ORGKEYCLOAK-19006623
- published20 Aug 2026
- disclosed28 Jul 2026
- creditUnknown
Introduced: 28 Jul 2026
NewCVE-2026-18217 (opens in a new tab)How to fix?
A fix was pushed into the master branch but not yet published.
Overview
org.keycloak:keycloak-saml-core is an Identity and Access Management plugin for Keycloak.
Affected versions of this package are vulnerable to Improper Handling of Extra Parameters through the generateRedirectUri logic in org.keycloak.saml.BaseSAML2BindingBuilder. An attacker can cause a user’s SAML login response to be appended to attacker-controlled query parameters by sending a crafted SAML HTTP-Redirect request that targets a client with a wildcard redirect URL. When the user authenticates, Keycloak preserves the attacker-supplied parameters alongside SAMLResponse or SAMLRequest and RelayState, which can make a service provider process the wrong values. This can log the user into the attacker’s chosen account or otherwise misassociate the authentication response with the wrong session.