CVE-2026-19607

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{"acknowledgement": "Red Hat would like to thank Anurag Mondal (NetSPI) for reporting this issue.", "affected_release": [{"advisory": "RHSA-2026:68276", "cpe": "cpe:/a:redhat:build_keycloak:26.4::el9", "package": "rhbk/keycloak-operator-bundle:26.4.16-2", "product_name": "Red Hat build of Keycloak 26.4", "release_date": "2026-09-16T00:00:00Z"}, {"advisory": "RHSA-2026:68276", "cpe": "cpe:/a:redhat:build_keycloak:26.4::el9", "package": "rhbk/keycloak-rhel9:26.4-26", "product_name": "Red Hat build of Keycloak 26.4", "release_date": "2026-09-16T00:00:00Z"}, {"advisory": "RHSA-2026:68276", "cpe": "cpe:/a:redhat:build_keycloak:26.4::el9", "package": "rhbk/keycloak-rhel9-operator:26.4-26", "product_name": "Red Hat build of Keycloak 26.4", "release_date": "2026-09-16T00:00:00Z"}, {"advisory": "RHSA-2026:68280", "cpe": "cpe:/a:redhat:build_keycloak:26.4::el9", "package": "keycloak-services", "product_name": "Red Hat build of Keycloak 26.4.16", "release_date": "2026-09-16T00:00:00Z"}, {"advisory": "RHSA-2026:68280", "cpe": "cpe:/a:redhat:build_keycloak:26.4::el9", "package": "rhbk-openshift-rhel9/rhbk-openshift-rhel9", "product_name": "Red Hat build of Keycloak 26.4.16", "release_date": "2026-09-16T00:00:00Z"}, {"advisory": "RHSA-2026:68277", "cpe": "cpe:/a:redhat:build_keycloak:26.6::el9", "package": "rhbk/keycloak-operator-bundle:26.6.7-3", "product_name": "Red Hat build of Keycloak 26.6", "release_date": "2026-09-16T00:00:00Z"}, {"advisory": "RHSA-2026:68277", "cpe": "cpe:/a:redhat:build_keycloak:26.6::el9", "package": "rhbk/keycloak-rhel9:26.6-20", "product_name": "Red Hat build of Keycloak 26.6", "release_date": "2026-09-16T00:00:00Z"}, {"advisory": "RHSA-2026:68277", "cpe": "cpe:/a:redhat:build_keycloak:26.6::el9", "package": "rhbk/keycloak-rhel9-operator:26.6-20", "product_name": "Red Hat build of Keycloak 26.6", "release_date": "2026-09-16T00:00:00Z"}, {"advisory": "RHSA-2026:68278", "cpe": "cpe:/a:redhat:build_keycloak:26.6::el9", "package": "keycloak-services", "product_name": "Red Hat build of Keycloak 26.6.7", "release_date": "2026-09-16T00:00:00Z"}, {"advisory": "RHSA-2026:68278", "cpe": "cpe:/a:redhat:build_keycloak:26.6::el9", "package": "rhbk-openshift-rhel9/rhbk-openshift-rhel9", "product_name": "Red Hat build of Keycloak 26.6.7", "release_date": "2026-09-16T00:00:00Z"}], "bugzilla": {"description": "keycloak-services: keycloak-services: Broker-originated username collision causes account lockout", "id": "2514529", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2514529"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.3", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "status": "verified"}, "cwe": "CWE-287", "details": ["A flaw was found in the first-broker-login flow of the keycloak-services component. This component handles the initial authentication and account linking when a user logs in via an external identity provider. The issue allows an attacker to register a matching username on an external provider to trigger a collision in Keycloak, which results in the legitimate user being locked out of 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-2026-19607", "package_state": [{"cpe": "cpe:/a:redhat:red_hat_single_sign_on:7", "fix_state": "Not affected", "package_name": "keycloak-services", "product_name": "Red Hat Single Sign-On 7"}], "public_date": "2026-09-16T13:01:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-19607\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-19607"], "statement": "The Red Hat Product Security team has assessed the severity of this vulnerability as Moderate, given that exploitation requires the attacker to be able to register a specific email address on a trusted external Identity Provider. Successful exploitation allows an attacker to perform a targeted denial-of-service by locking a specific user out of their account. The vulnerability's root cause is a lack of collision prevention during the first-broker-login authentication flow.", "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": null}], "enrichment": {"confidence": 100.0, "confidence_source": "manual", "scores": [{"score": 100.0, "source": "manual"}]}, "original": {"product": "Red Hat build of Keycloak 26.6.7", "source": "cna", "vendor": "Red Hat"}, "product": "build_of_keycloak", "vendor": "redhat"}, {"configurations": [{"platform": null, "status": "affected", "versions": null}], "enrichment": {"confidence": 95.0, "confidence_source": "matching", "scores": [{"score": 95.0, "source": "matching"}]}, "original": {"product": "Red Hat Single Sign-On 7", "source": "cna", "vendor": "Red Hat"}, "product": "red_hat_single_sign_on", "vendor": "redhat"}], "created": "2026-09-18T00:15:13.550634+00:00", "updated": "2026-09-19T22:37:44.807843+00:00", "vendors": ["redhat", "redhat$PRODUCT$build_of_keycloak", "redhat$PRODUCT$red_hat_single_sign_on"]}