HIGH7.1
GHSA-hq3p-w4xv-x7vp
Keycloak: Access token disclosure and implicit flow bypass via forged client data
Quick fix
GHSA-hq3p-w4xv-x7vp — org.keycloak:keycloak-services: upgrade to the fixed version with the command below.
# pom.xml: bump <version>26.6.2</version> for org.keycloak:keycloak-servicesDetails
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.
Are you affected?
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Affected packages
Maven/org.keycloak:keycloak-services
Introduced in:
0Fixed in: 26.6.2Fix
# pom.xml: bump <version>26.6.2</version> for org.keycloak:keycloak-servicesReferences
- https://nvd.nist.gov/vuln/detail/CVE-2026-7571[ADVISORY]
- https://github.com/keycloak/keycloak/issues/49110[WEB]
- https://github.com/keycloak/keycloak/pull/49120[WEB]
- https://github.com/keycloak/keycloak/commit/56bbfa3d8abccf39df787ae73e044a75aba1da13[WEB]
- https://access.redhat.com/errata/RHSA-2026:19596[WEB]
- https://access.redhat.com/errata/RHSA-2026:19597[WEB]
- https://access.redhat.com/security/cve/CVE-2026-7571[WEB]
- https://bugzilla.redhat.com/show_bug.cgi?id=2464263[WEB]
- https://github.com/keycloak/keycloak[PACKAGE]
- https://github.com/keycloak/keycloak/releases/tag/26.6.2[WEB]