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GHSA-hq3p-w4xv-x7vp

Keycloak: Access token disclosure and implicit flow bypass via forged client data

Source: GitHub Advisory Database (reviewed) High CVE-2026-7571

Packages

EcosystemPackageAffectedFixed in
Maven org.keycloak:keycloak-services < 26.6.2 26.6.2

Details

As written in the advisory (Markdown source, shown as plain text).

A flaw was found in Keycloak. A low-privilege user, with knowledge of user credentials and client ID, can bypass a security control intended to disable the implicit flow in OpenID Connect (OIDC) clients. By manipulating client data during a session restart, an attacker can obtain an access token that should not be available. This vulnerability can also lead to the exposure of these access tokens in server logs, proxy logs, and HTTP Referrer headers, resulting in sensitive information disclosure.

References

External links from the advisory. They lead to third-party sites.