Origin Validation Error 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.
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-15922362
- published7 Apr 2026
- disclosed6 Apr 2026
- creditUnknown
Introduced: 6 Apr 2026
NewCVE-2026-37977 (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 Origin Validation Error in the UMA token endpoint when the azp claim from a client-supplied JWT is used to set the Access-Control-Allow-Origin header before the JWT signature is validated. An attacker can cause low-sensitivity information from authorization server error responses to be exposed by injecting a specially crafted JWT with a malicious azp value, which is reflected as the CORS origin.
Note:
This is only exploitable if the target client is misconfigured with webOrigins: ["*"].