{ "document": { "category": "csaf_base", "csaf_version": "2.0", "distribution": { "tlp": { "label": "WHITE" } }, "lang": "en", "notes": [ { "category": "legal_disclaimer", "text": "The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this portal to enhance access to its information and vulnerabilities. The use of this information is subject to the following terms and conditions:\n\nThe vulnerabilities disclosed in this portal are gathered by NCSC-NL from a variety of open sources, which the user can retrieve from other platforms. NCSC-NL makes every reasonable effort to ensure that the content of this portal is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or real-time keeping up-to-date. NCSC-NL does not control nor guarantee the accuracy, relevance, timeliness or completeness of information obtained from these external sources. The vulnerabilities disclosed in this portal are intended solely for the convenience of professional parties to take appropriate measures to manage the risks posed to the cybersecurity. No rights can be derived from the information provided therein.\n\nNCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of the vulnerabilities disclosed in this portal. This includes damage resulting from the inaccuracy of incompleteness of the information contained in it.\nThe information on this page is subject to Dutch law. All disputes related to or arising from the use of this portal regarding the disclosure of vulnerabilities will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings." } ], "publisher": { "category": "coordinator", "contact_details": "cert@ncsc.nl", "name": "National Cyber Security Centre", "namespace": "https://www.ncsc.nl/" }, "title": "CVE-2026-15571", "tracking": { "current_release_date": "2026-08-25T13:40:06.307237Z", "generator": { "date": "2026-02-17T15:00:00Z", "engine": { "name": "V.E.L.M.A", "version": "1.7" } }, "id": "CVE-2026-15571", "initial_release_date": "2026-08-18T21:25:46.757015Z", "revision_history": [ { "date": "2026-08-18T21:25:46.757015Z", "number": "1", "summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (4).| CWES updated (1)." }, { "date": "2026-08-18T21:25:49.213247Z", "number": "2", "summary": "NCSC Score created." }, { "date": "2026-08-18T21:42:31.860420Z", "number": "3", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (2).| Product Identifiers created (2).| References created (4).| CWES updated (1)." }, { "date": "2026-08-18T21:42:33.160398Z", "number": "4", "summary": "NCSC Score updated." }, { "date": "2026-08-19T00:27:55.787467Z", "number": "5", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (7).| Product Identifiers created (5).| Products created (7).| References created (2).| CWES updated (1).| Vendor_assessment created." }, { "date": "2026-08-19T00:28:01.245300Z", "number": "6", "summary": "NCSC Score updated." }, { "date": "2026-08-19T11:13:29.692354Z", "number": "7", "summary": "Source created.| CVE status created. (valid)| Products connected (1).| References created (3)." }, { "date": "2026-08-19T11:13:31.482234Z", "number": "8", "summary": "NCSC Score updated." }, { "date": "2026-08-19T13:28:58.316280Z", "number": "9", "summary": "Source connected.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (4).| Product Remediations created (4).| Product Identifiers created (8).| Product Identifiers removed (8).| References created (7).| CWES updated (1)." }, { "date": "2026-08-19T13:29:03.843825Z", "number": "10", "summary": "Source connected.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (1).| Product Remediations created (1).| References created (7).| CWES updated (1)." }, { "date": "2026-08-19T13:29:10.386540Z", "number": "11", "summary": "NCSC Score updated." }, { "date": "2026-08-19T16:31:00.106092Z", "number": "12", "summary": "Source connected.| CVE status created. (valid)| EPSS created." }, { "date": "2026-08-19T16:31:01.812308Z", "number": "13", "summary": "NCSC Score updated." }, { "date": "2026-08-20T14:38:57.698731Z", "number": "14", "summary": "Unknown change." }, { "date": "2026-08-20T14:38:59.356878Z", "number": "15", "summary": "NCSC Score updated." }, { "date": "2026-08-25T06:05:46.958091Z", "number": "16", "summary": "Products connected (2).| Product Identifiers created (2).| References created (5)." }, { "date": "2026-08-25T07:28:38.822791Z", "number": "17", "summary": "NCSC Score updated." }, { "date": "2026-08-25T13:39:58.403653Z", "number": "18", "summary": "Source connected.| CVE status created. (valid)" }, { "date": "2026-08-25T13:40:01.511239Z", "number": "19", "summary": "NCSC Score updated." } ], "status": "interim", "version": "19" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/keycloak", "product": { "name": "vers:unknown/keycloak", "product_id": "CSAFPID-5187459", "product_identification_helper": { "cpe": "cpe:/o:redhat:enterprise_linux:keycloak" } } } ], "category": "product_name", "name": "Enterprise Linux" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/8", "product": { "name": "vers:rpm/8", "product_id": "CSAFPID-1439292", "product_identification_helper": { "cpe": "cpe:/a:redhat:jboss_data_grid:8" } } } ], "category": "product_name", "name": "Red Hat Data Grid 8" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/unknown", "product": { "name": "vers:unknown/unknown", "product_id": "CSAFPID-1317175", "product_identification_helper": { "cpe": "cpe:/o:redhat:enterprise_linux:-" } } } ], "category": "product_name", "name": "Red Hat Enterprise Linux" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-1439304", "product_identification_helper": { "cpe": "cpe:/a:redhat:jbosseapxp" } } } ], "category": "product_name", "name": "Red Hat JBoss Enterprise Application Platform Expansion Pack" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/7", "product": { "name": "vers:rpm/7", "product_id": "CSAFPID-1439308", "product_identification_helper": { "cpe": "cpe:/a:redhat:red_hat_single_sign_on:7" } } } ], "category": "product_name", "name": "Red Hat Single Sign-On 7" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/26.6", "product": { "name": "vers:rpm/26.6", "product_id": "CSAFPID-8300668", "product_identification_helper": { "cpe": "cpe:/a:redhat:build_keycloak:26.6::el9" } } } ], "category": "product_name", "name": "Red Hat build of Keycloak 26.6" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/26.6", "product": { "name": "vers:rpm/26.6", "product_id": "CSAFPID-9013387", "product_identification_helper": { "cpe": "cpe:/a:redhat:build_keycloak:26.6" } } } ], "category": "product_name", "name": "Red Hat build of Keycloak 26.6.6" }, { "branches": [ { "category": "product_version_range", "name": "vers:oci/26.6.6-1", "product": { "name": "vers:oci/26.6.6-1", "product_id": "CSAFPID-9013384", "product_identification_helper": { "purl": "pkg:oci/keycloak-operator-bundle@sha256:59dc8a796829d2ffd605425348c9801ae38823da3269006a1fcc7d013a41eb30?arch=amd64&repository_url=registry.redhat.io/rhbk/keycloak-operator-bundle&tag=26.6.6-1" } } } ], "category": "product_name", "name": "keycloak-operator-bundle" }, { "branches": [ { "category": "product_version_range", "name": "vers:oci/26.6-12", "product": { "name": "vers:oci/26.6-12", "product_id": "CSAFPID-9013386", "product_identification_helper": { "purl": "pkg:oci/keycloak-rhel9@sha256:e5a8533ccec075ff65f3447fd186a14069452e4446331a8f95530a2a86cb52a7?arch=s390x&repository_url=registry.redhat.io/rhbk/keycloak-rhel9&tag=26.6-12" } } } ], "category": "product_name", "name": "keycloak-rhel9" }, { "branches": [ { "category": "product_version_range", "name": "vers:oci/26.6-12", "product": { "name": "vers:oci/26.6-12", "product_id": "CSAFPID-9013385", "product_identification_helper": { "purl": "pkg:oci/keycloak-rhel9-operator@sha256:c32f09e3b7c212e7fd6b4a9b7b5857e4fd18d4416e5d256ca99299377edeb05e?arch=ppc64le&repository_url=registry.redhat.io/rhbk/keycloak-rhel9-operator&tag=26.6-12" } } } ], "category": "product_name", "name": "keycloak-rhel9-operator" } ], "category": "product_family", "name": "Red Hat build of Keycloak" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/26.6", "product": { "name": "vers:rpm/26.6", "product_id": "CSAFPID-8502107", "product_identification_helper": { "cpe": "cpe:/a:redhat:build_keycloak:26.6::el9" } } }, { "category": "product_version_range", "name": "vers:rpm/26.6-12|<*", "product": { "name": "vers:rpm/26.6-12|<*", "product_id": "CSAFPID-9008647", "product_identification_helper": { "cpe": "cpe:/a:redhat:build_keycloak:26.6::el9" } } }, { "category": "product_version_range", "name": "vers:rpm/26.6.6-1|<*", "product": { "name": "vers:rpm/26.6.6-1|<*", "product_id": "CSAFPID-9008648", "product_identification_helper": { "cpe": "cpe:/a:redhat:build_keycloak:26.6::el9" } } } ], "category": "product_name", "name": "Red Hat build of Keycloak 26.6" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/26.6", "product": { "name": "vers:rpm/26.6", "product_id": "CSAFPID-9008988", "product_identification_helper": { "cpe": "cpe:/a:redhat:build_keycloak:26.6" } } } ], "category": "product_name", "name": "Red Hat build of Keycloak 26.6.6" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-9008991" } } ], "category": "product_name", "name": "keycloak-rhel9" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-9008990" } } ], "category": "product_name", "name": "keycloak-services" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-9008992" } } ], "category": "product_name", "name": "rhbk-openshift-rhel9" } ], "category": "product_family", "name": "Red Hat build of Keycloak 26.6.6" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-9008985" } } ], "category": "product_name", "name": "keycloak-rhel9-container-26.6-12" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-9008986" } } ], "category": "product_name", "name": "keycloak-rhel9-operator-bundle-container-26.6.6" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-9008987" } } ], "category": "product_name", "name": "keycloak-rhel9-operator-container-26.6-12" } ], "category": "product_family", "name": "Red Hat build of Keycloak 26.6" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-8253508" } } ], "category": "product_name", "name": "keycloak-services" } ], "category": "product_family", "name": "Red Hat Data Grid 8" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-2986457" } } ], "category": "product_name", "name": "keycloak-services" } ], "category": "product_family", "name": "Red Hat JBoss Enterprise Application Platform Expansion Pack" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-2563053" } } ], "category": "product_name", "name": "keycloak-services" } ], "category": "product_family", "name": "Red Hat Single Sign-On 7" } ], "category": "vendor", "name": "Red Hat" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/<26.7.2", "product": { "name": "vers:unknown/<26.7.2", "product_id": "CSAFPID-9012188" } } ], "category": "product_name", "name": "Keycloak" } ], "category": "vendor", "name": "Open Source" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-15571", "cwe": { "id": "CWE-341", "name": "Predictable from Observable State" }, "notes": [ { "category": "description", "text": "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.", "title": "nvd - https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-15571" }, { "category": "description", "text": "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.", "title": "cveprojectv5 - https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/15xxx/CVE-2026-15571.json" }, { "category": "description", "text": "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.\nThe Red Hat Product Security team has assessed the severity of this vulnerability as Important, given that it enables full account takeover through a predictable security hash. Successful exploitation allows an attacker to link an unauthorized identity to a victim's account and subsequently impersonate that user across the realm. The vulnerability's root cause is the use of predictable session identifiers and client-known metadata in the construction of the account-linking CSRF protection hash.", "title": "redhat - https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-15571.json" }, { "category": "description", "text": "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.", "title": "redhat - https://access.redhat.com/hydra/rest/securitydata/csaf/RHSA-2026:56524.json" }, { "category": "description", "text": "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.", "title": "redhat - https://access.redhat.com/hydra/rest/securitydata/csaf/RHSA-2026:56523.json" }, { "category": "other", "text": "0.00309", "title": "EPSS" }, { "category": "other", "text": "4.2", "title": "NCSC Score" }, { "category": "other", "text": "VENDOR FIX as product remediation category, There is product data available from source Certbundde", "title": "NCSC Score top increasing factors" }, { "category": "other", "text": "There is product_remediation data available from source Redhat, There is cwe data available from source Nvd", "title": "NCSC Score top decreasing factors" }, { "category": "details", "text": "Severity: 3\n", "title": "Vendor assessment" } ], "product_status": { "fixed": [ "CSAFPID-9013384", "CSAFPID-9013385", "CSAFPID-9013386", "CSAFPID-9013387" ], "known_affected": [ "CSAFPID-8502107", "CSAFPID-9008985", "CSAFPID-9008986", "CSAFPID-9008987", "CSAFPID-9008988", "CSAFPID-9008990", "CSAFPID-9008991", "CSAFPID-9008992", "CSAFPID-9012188", "CSAFPID-1317175", "CSAFPID-5187459" ], "known_not_affected": [ "CSAFPID-9008647", "CSAFPID-9008648", "CSAFPID-1439292", "CSAFPID-1439304", "CSAFPID-1439308", "CSAFPID-2563053", "CSAFPID-2986457", "CSAFPID-8253508" ] }, "references": [ { "category": "external", "summary": "Source - ncscclear", "url": "https://advisories.ncsc.nl/advisory?id=NCSC-2026-0326" }, { "category": "external", "summary": "Source - redhat", "url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-15571.json" }, { "category": "external", "summary": "Source - nvd", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-15571" }, { "category": "external", "summary": "Source - cveprojectv5", "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/15xxx/CVE-2026-15571.json" }, { "category": "external", "summary": "Source - certbundde", "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-2915.json" }, { "category": "external", "summary": "Source - redhat", "url": "https://access.redhat.com/hydra/rest/securitydata/csaf/RHSA-2026:56524.json" }, { "category": "external", "summary": "Source - redhat", "url": "https://access.redhat.com/hydra/rest/securitydata/csaf/RHSA-2026:56523.json" }, { "category": "external", "summary": "Source - first", "url": "https://api.first.org/data/v1/epss?limit=10000&offset=40000" }, { "category": "external", "summary": "Source - ncscclear", "url": "https://vulnerabilities.ncsc.nl/manual/CVE-2026-15571" }, { "category": "external", "summary": "Reference - redhat", "url": "https://www.cve.org/CVERecord?id=CVE-2026-15571" }, { "category": "external", "summary": "Reference - redhat", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-15571" }, { "category": "external", "summary": "Reference - certbundde; cveprojectv5; nvd; redhat", "url": "https://access.redhat.com/errata/RHSA-2026:56523" }, { "category": "external", "summary": "Reference - certbundde; cveprojectv5; nvd; redhat", "url": "https://access.redhat.com/errata/RHSA-2026:56524" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd; redhat", "url": "https://access.redhat.com/security/cve/CVE-2026-15571" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd; redhat", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2499591" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-2915.json" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-2915" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://www.keycloak.org/2026/08/keycloak-2672-released" }, { "category": "external", "summary": "Reference - redhat", "url": "https://access.redhat.com/security/updates/classification/#critical" }, { "category": "external", "summary": "Reference - redhat", "url": "https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_56524.json" }, { "category": "external", "summary": "Reference - redhat", "url": "https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_56523.json" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://access.redhat.com/errata/RHSA-2026:56520" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://access.redhat.com/errata/RHSA-2026:56519" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://github.com/Red-Darkin/CVE-2026-18963-keycloak" } ], "remediations": [ { "category": "vendor_fix", "details": "Before applying the update, back up your existing installation,\nincluding all applications, configuration files, databases and\ndatabase settings, and so on.", "product_ids": [ "CSAFPID-8300668", "CSAFPID-9013384", "CSAFPID-9013385", "CSAFPID-9013386" ], "restart_required": { "category": "none" }, "url": "https://access.redhat.com/errata/RHSA-2026:56524" }, { "category": "vendor_fix", "details": "Before applying the update, back up your existing installation,\nincluding all applications, configuration files, databases and\ndatabase settings, and so on.", "product_ids": [ "CSAFPID-9013387" ], "restart_required": { "category": "none" }, "url": "https://access.redhat.com/errata/RHSA-2026:56523" } ], "scores": [ { "cvss_v3": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N", "baseScore": 7.3, "baseSeverity": "HIGH" }, "products": [ "CSAFPID-1317175", "CSAFPID-5187459", "CSAFPID-8502107", "CSAFPID-9008985", "CSAFPID-9008986", "CSAFPID-9008987", "CSAFPID-9008988", "CSAFPID-9008990", "CSAFPID-9008991", "CSAFPID-9008992", "CSAFPID-9012188" ] } ], "title": "CVE-2026-15571" } ] }