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{"acknowledgement": "Red Hat would like to thank Adam Korczynski (Ada Logics Ltd) and Anthropic for reporting this issue.", "bugzilla": {"description": "keycloak-services: keycloak-services: OIDC logout endpoint session fixation via id_token_hint leading to account takeover", "id": "2547298", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2547298"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.4", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N", "status": "draft"}, "cwe": "CWE-384", "details": ["A flaw was found in the OIDC logout endpoint of the keycloak-services component, which handles user session termination in Red Hat Build of Keycloak. The issue occurs because the system sets a session cookie based on an unvalidated token hint before completing security checks. An attacker can use this flaw to fix a session ID in a victim's browser, allowing them to hijack the victim's subsequent login and gain full control over their account."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability."}, "name": "CVE-2026-107124", "package_state": [{"cpe": "cpe:/a:redhat:build_keycloak:", "fix_state": "Affected", "package_name": "keycloak-services", "product_name": "Red Hat Build of Keycloak"}, {"cpe": "cpe:/a:redhat:build_keycloak:", "fix_state": "Affected", "package_name": "rhbk/keycloak-rhel9", "product_name": "Red Hat Build of Keycloak"}, {"cpe": "cpe:/a:redhat:red_hat_single_sign_on:7", "fix_state": "Fix deferred", "package_name": "keycloak-services", "product_name": "Red Hat Single Sign-On 7"}], "public_date": "2026-11-05T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-107124\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-107124"], "statement": "The Red Hat Product Security team has assessed the severity of this vulnerability as Important, given that it requires the victim to have no active session and be induced to visit a crafted URL within a specific timing window. Successful exploitation allows an attacker to achieve full account takeover of any user in the realm, including administrators. The vulnerability's root cause is the premature setting of session cookies before token validation and the reuse of authentication session IDs during login.", "threat_severity": "Moderate"}

{"created": "2026-11-06T02:00:10.167651+00:00", "updated": "2026-11-06T02:00:10.167656+00:00", "vendors": []}