Keycloak: keycloak: access token disclosure and implicit flow bypass via forged client data
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
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| Red Hat | Red Hat build of Keycloak 26.4 | affected |
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| Red Hat | Red Hat build of Keycloak 26.4 | affected |
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| Red Hat | Red Hat build of Keycloak 26.4 | affected |
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| Red Hat | Red Hat build of Keycloak 26.4.12 | unaffected | — |
No data.
| Vendor | Product | Versions | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Redhat | Build Keycloak |
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Vendor Workaround
To mitigate this issue, restrict network access to the Keycloak authentication endpoint to trusted clients and networks. Implement firewall rules to control inbound connections to the Keycloak service ports, thereby reducing the attack surface and limiting who can initiate authentication flows and potentially exploit the implicit flow bypass. If the Keycloak service is reloaded or restarted, ensure these network restrictions remain in effect.
| Source | ID | Title |
|---|---|---|
Github GHSA |
GHSA-hq3p-w4xv-x7vp | Keycloak: Access token disclosure and implicit flow bypass via forged client data |
No CVSS v4.0
No CVSS v3.0
No CVSS v2
This CVE is not in the KEV list.
Exploit prediction score: < 1% (0.415% probability within 30 days)
| Type | Values Removed | Values Added |
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| First Time appeared |
Redhat build Of Keycloak
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| CPEs | cpe:2.3:a:redhat:build_of_keycloak:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Redhat build Of Keycloak
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| References |
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| Type | Values Removed | Values Added |
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| CPEs | cpe:/a:redhat:build_keycloak:26.4::el9 | |
| References |
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| Metrics |
ssvc
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| References |
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| Metrics |
threat_severity
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threat_severity
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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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