Improper Validation of Consistency within Input Affecting org.keycloak:keycloak-services package, versions [26.5.0,]
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.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applications- Snyk IDSNYK-JAVA-ORGKEYCLOAK-18751613
- published13 Aug 2026
- disclosed28 Jul 2026
- creditUnknown
Introduced: 28 Jul 2026
NewCVE-2026-18209 (opens in a new tab)How to fix?
There is no fixed version for org.keycloak:keycloak-services.
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 Improper Validation of Consistency within Input during OIDC authentication flow processing. An attacker can inject duplicate security parameters into the login response by supplying a crafted redirect URL with a fragment portion that bypasses the parameter-pollution check. If a client is configured with a wildcard redirect URI and the application trusts the injected values, the attacker can cause session fixation or account confusion, breaking the user’s login session and causing the app to associate the session with the wrong identity or security context.