Replay Attack Affecting org.keycloak:keycloak-services 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-19006664
- published20 Aug 2026
- disclosed31 Jul 2026
- creditUnknown
Introduced: 31 Jul 2026
NewCVE-2026-18967 (opens in a new tab)How to fix?
A fix was pushed into the master branch but not yet published.
Overview
org.keycloak:keycloak-services is an open source identity and access management solution for modern applications and services.
Affected versions of this package are vulnerable to Replay Attack through IdP-initiated broker logins in the services/src/main/java/org/keycloak/broker/saml component. An attacker can hijack a user session and gain unauthorized access by resending a captured, valid SAML assertion that contains a OneTimeUse condition. When Keycloak accepts the assertion without tracking whether that assertion ID was already used, the same unused response can be replayed multiple times against the broker flow. This affects deployments using Keycloak as a SAML identity broker with IdP-initiated login enabled.