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{"acknowledgement": "Red Hat would like to thank Martin Barto\u0161 for reporting this issue.", "bugzilla": {"description": "keycloak: org.keycloak.protocol.oidc: HTTP Parameter Pollution in OIDC redirect URI allows response parameter duplication - #GHI-604", "id": "2481845", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2481845"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.2", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N", "status": "draft"}, "cwe": "CWE-1288", "details": ["A flaw was found in Keycloak, an open-source identity and access management solution. When a client application is configured to accept broad redirect Uniform Resource Identifiers (URIs), a remote attacker can manipulate the authentication process by crafting a special web address. If a user clicks this link, the client application might incorrectly prioritize attacker-controlled information over legitimate data. This vulnerability, known as HTTP parameter pollution, could allow an attacker to bypass security measures or gain unauthorized access to resources."], "name": "CVE-2026-9689", "package_state": [{"cpe": "cpe:/a:redhat:build_keycloak:", "fix_state": "Fix deferred", "package_name": "rhbk/keycloak-rhel9", "product_name": "Red Hat Build of Keycloak"}], "public_date": "2026-05-27T10:18:25Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-9689\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-9689"], "statement": "This Moderate severity flaw in Keycloak arises from HTTP parameter pollution when a client is configured with a wildcard redirect URI. An attacker could craft a malicious authorization URL that, if clicked by a user, may lead to the client application incorrectly processing attacker-controlled OIDC response parameters. Exploitation is contingent on the client application employing a 'first-wins' strategy for duplicate query parameters, which is not a universal behavior.", "threat_severity": "Moderate"}