GHSA-hq3p-w4xv-x7vp
Keycloak: Access token disclosure and implicit flow bypass via forged client data
At a glance
- Published
- Updated
- CVE
- CVE-2026-7571
- Aliases
- BIT-keycloak-2026-7571
- CVSS_V3
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
Description
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.
Affected packages
| Package | Versions |
|---|---|
| Maven · org.keycloak:keycloak-services | introduced 0, fixed 26.6.2 |
References
- 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
Sources
| Source | Licence |
|---|---|
| OSV.dev | CC-BY 4.0 — GitHub Advisory Database |