{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-15571", "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749", "state": "PUBLISHED", "assignerShortName": "redhat", "dateReserved": "2026-07-13T07:12:45.061Z", "datePublished": "2026-08-18T20:40:17.770Z", "dateUpdated": "2026-08-18T20:45:34.499Z"}, "containers": {"cna": {"title": "Keycloak-services: keycloak-services: predictable account-linking hash enables account takeover via malicious oidc client", "metrics": [{"other": {"content": {"value": "Important", "namespace": "https://access.redhat.com/security/updates/classification/"}, "type": "Red Hat severity rating"}}, {"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.3, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N", "version": "3.1"}, "format": "CVSS"}], "descriptions": [{"lang": "en", "value": "A flaw was found in the legacy client-initiated account-linking endpoint of Keycloak, a widely used open-source identity and access management solution. The mechanism used to protect the account-linking process from unauthorized requests relies on a hash that can be predicted by a malicious OIDC client. By tricking a user into authenticating, an attacker-controlled client can forge a valid linking URL to connect the victim's account to an attacker's external identity. This results in a full account takeover, allowing the attacker to log in as the victim."}], "affected": [{"vendor": "Red Hat", "product": "Red Hat build of Keycloak 26.6", "collectionURL": "https://catalog.redhat.com/software/containers/", "packageName": "keycloak-rhel9-container", "defaultStatus": "affected", "versions": [{"version": "26.6-12", "lessThan": "*", "versionType": "rpm", "status": "unaffected"}], "cpes": ["cpe:/a:redhat:build_keycloak:26.6::el9"]}, {"vendor": "Red Hat", "product": "Red Hat build of Keycloak 26.6", "collectionURL": "https://catalog.redhat.com/software/containers/", "packageName": "keycloak-rhel9-operator-bundle-container", "defaultStatus": "affected", "versions": [{"version": "26.6.6-1", "lessThan": "*", "versionType": "rpm", "status": "unaffected"}], "cpes": ["cpe:/a:redhat:build_keycloak:26.6::el9"]}, {"vendor": "Red Hat", "product": "Red Hat build of Keycloak 26.6", "collectionURL": "https://catalog.redhat.com/software/containers/", "packageName": "keycloak-rhel9-operator-container", "defaultStatus": "affected", "versions": [{"version": "26.6-12", "lessThan": "*", "versionType": "rpm", "status": "unaffected"}], "cpes": ["cpe:/a:redhat:build_keycloak:26.6::el9"]}, {"vendor": "Red Hat", "product": "Red Hat build of Keycloak 26.6.6", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "unaffected", "packageName": "keycloak-services", "cpes": ["cpe:/a:redhat:build_keycloak:26.6"]}, {"vendor": "Red Hat", "product": "Red Hat build of Keycloak 26.6.6", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "unaffected", "packageName": "rhbk/keycloak-rhel9", "cpes": ["cpe:/a:redhat:build_keycloak:26.6"]}, {"vendor": "Red Hat", "product": "Red Hat build of Keycloak 26.6.6", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "unaffected", "packageName": "rhbk-openshift-rhel9/rhbk-openshift-rhel9", "cpes": ["cpe:/a:redhat:build_keycloak:26.6"]}, {"vendor": "Red Hat", "product": "Red Hat Data Grid 8", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "keycloak-services", "defaultStatus": "unaffected", "cpes": ["cpe:/a:redhat:jboss_data_grid:8"]}, {"vendor": "Red Hat", "product": "Red Hat JBoss Enterprise Application Platform Expansion Pack", "collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html", "packageName": "keycloak-services", "defaultStatus": "unaffected", "cpes": ["cpe:/a:redhat:jbosseapxp"]}, {"vendor": "Red Hat", "product": "Red Hat Single Sign-On 7", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "keycloak-services", "defaultStatus": "unaffected", "cpes": ["cpe:/a:redhat:red_hat_single_sign_on:7"]}], "references": [{"url": "https://access.redhat.com/errata/RHSA-2026:56523", "name": "RHSA-2026:56523", "tags": ["vendor-advisory", "x_refsource_REDHAT"]}, {"url": "https://access.redhat.com/errata/RHSA-2026:56524", "name": "RHSA-2026:56524", "tags": ["vendor-advisory", "x_refsource_REDHAT"]}, {"url": "https://access.redhat.com/security/cve/CVE-2026-15571", "tags": ["vdb-entry", "x_refsource_REDHAT"]}, {"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2499591", "name": "RHBZ#2499591", "tags": ["issue-tracking", "x_refsource_REDHAT"]}], "datePublic": "2026-08-18T19:41:18.051Z", "problemTypes": [{"descriptions": [{"cweId": "CWE-341", "description": "Predictable from Observable State", "lang": "en", "type": "CWE"}]}], "x_redhatCweChain": "CWE-341: Predictable from Observable State", "timeline": [{"lang": "en", "time": "2026-07-07T18:49:21.000Z", "value": "Reported to Red Hat."}, {"lang": "en", "time": "2026-08-18T19:41:18.051Z", "value": "Made public."}], "credits": [{"lang": "en", "value": "Red Hat would like to thank yd1ng for reporting this issue."}], "providerMetadata": {"orgId": "53f830b8-0a3f-465b-8143-3b8a9948e749", "shortName": "redhat", "dateUpdated": "2026-08-18T20:45:34.499Z"}, "x_generator": {"engine": "cvelib 1.8.0"}}}}

{}

{}

{}

{}