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.
Metrics
Affected Vendors & Products
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History
Tue, 19 May 2026 12:30:00 +0000
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ssvc
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Tue, 19 May 2026 12:15:00 +0000
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threat_severity
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threat_severity
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Tue, 19 May 2026 11:30:00 +0000
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| 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. | |
| Title | Keycloak: keycloak: access token disclosure and implicit flow bypass via forged client data | |
| First Time appeared |
Redhat
Redhat build Keycloak |
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| Weaknesses | CWE-472 | |
| CPEs | cpe:/a:redhat:build_keycloak: | |
| Vendors & Products |
Redhat
Redhat build Keycloak |
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| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: redhat
Published:
Updated: 2026-05-19T12:00:14.931Z
Reserved: 2026-04-30T22:21:27.850Z
Link: CVE-2026-7571
Updated: 2026-05-19T11:58:48.969Z
Status : Awaiting Analysis
Published: 2026-05-19T12:16:19.820
Modified: 2026-05-19T14:25:40.320
Link: CVE-2026-7571
OpenCVE Enrichment
Updated: 2026-05-19T13:30:05Z