CVE-2026-4366

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Este problema puede llevar a la revelaci\u00f3n de informaci\u00f3n y permitir a los atacantes mapear la infraestructura de red interna."}], "id": "CVE-2026-4366", "lastModified": "2026-06-17T10:56:29.000", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.8, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 1.4, "source": "secalert@redhat.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-4366", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-03-18T17:39:24.937155Z", "version": "2.0.3"}}]}, "published": "2026-03-18T04:17:32.450", "references": [{"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:19596"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:19597"}, {"source": "secalert@redhat.com", "tags": ["Vendor Advisory"], "url": "https://access.redhat.com/security/cve/CVE-2026-4366"}, {"source": "secalert@redhat.com", "tags": ["Issue Tracking", "Vendor Advisory"], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2448543"}], "sourceIdentifier": "secalert@redhat.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-918"}], "source": "secalert@redhat.com", "type": "Secondary"}]}

{"acknowledgement": "Red Hat would like to thank Georgije Vukov (Elite Security Systems) for reporting this issue.", "bugzilla": {"description": "keycloak-services: Blind Server-Side Request Forgery (SSRF) via HTTP Redirect Handling in Keycloak", "id": "2448543", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2448543"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.8", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N", "status": "draft"}, "cwe": "CWE-918", "details": ["A flaw was identified in Keycloak, an identity and access management solution, where it improperly follows HTTP redirects when processing certain client configuration requests. This behavior allows an attacker to trick the server into making unintended requests to internal or restricted resources. As a result, sensitive internal services such as cloud metadata endpoints could be accessed. This issue may lead to information disclosure and enable attackers to map internal network infrastructure."], "mitigation": {"lang": "en:us", "value": "To mitigate this vulnerability, restrict the outbound network access of the Keycloak instance. Configure firewall rules to prevent the Keycloak server from initiating connections to internal network segments, especially to well-known cloud metadata service IP addresses such as `169.254.169.254`. For example, on Red Hat Enterprise Linux, you can use `firewalld` to add a rich rule:\n`sudo firewall-cmd --permanent --zone=public --add-rich-rule='rule family=\"ipv4\" destination address=\"169.254.169.254\" reject'`\n`sudo firewall-cmd --reload`\nThis may impact other services if they legitimately rely on accessing these internal IPs. Additionally, ensure that any configured `sector_identifier_uri` values are thoroughly validated to only point to trusted, external URLs that do not perform redirects to internal resources."}, "name": "CVE-2026-4366", "package_state": [{"cpe": "cpe:/a:redhat:build_keycloak:", "fix_state": "Fix deferred", "package_name": "rhbk/keycloak-operator-bundle", "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:build_keycloak:", "fix_state": "Fix deferred", "package_name": "rhbk/keycloak-rhel9-operator", "product_name": "Red Hat Build of Keycloak"}, {"cpe": "cpe:/a:redhat:jboss_enterprise_application_platform:8", "fix_state": "Fix deferred", "package_name": "keycloak-services", "product_name": "Red Hat JBoss Enterprise Application Platform 8"}, {"cpe": "cpe:/a:redhat:jbosseapxp", "fix_state": "Fix deferred", "package_name": "keycloak-services", "product_name": "Red Hat JBoss Enterprise Application Platform Expansion Pack"}, {"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": "2026-03-18T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-4366\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-4366"], "statement": "MODERATE impact: Keycloak is vulnerable to a blind Server-Side Request Forgery (SSRF) due to improper handling of HTTP redirects during client configuration. An attacker can exploit this remotely without authentication or user interaction by crafting a `sector_identifier_uri` that redirects to internal resources, potentially leading to information disclosure and internal network reconnaissance.", "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", "source": "cna", "vendor": "Red Hat"}, "product": "build_keycloak", "vendor": "redhat"}, {"configurations": [{"platform": null, "status": "affected", "versions": null}], "original": {"product": "Red Hat Build of Keycloak", "source": "cna", "vendor": "Red Hat"}, "product": "build_of_keycloak", "vendor": "redhat"}, {"configurations": [{"platform": null, "status": "affected", "versions": null}], "enrichment": {"confidence": 89.0, "confidence_source": "matching", "scores": [{"score": 89.0, "source": "matching"}]}, "original": {"product": "Red Hat JBoss Enterprise Application Platform 8", "source": "cna", "vendor": "Red Hat"}, "product": "jboss_enterprise_application_platform", "vendor": "redhat"}, {"configurations": [{"platform": null, "status": "affected", "versions": null}], "enrichment": {"confidence": 93.0, "confidence_source": "matching", "scores": [{"score": 93.0, "source": "matching"}]}, "original": {"product": "Red Hat JBoss Enterprise Application Platform Expansion Pack", "source": "cna", "vendor": "Red Hat"}, "product": "jboss_enterprise_application_platform_expansion_pack", "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"}], "analysis": {"en": {"generated_at": "2026-04-02T05:05:21.050533+00:00", "value": {"mitigation_remediation": ["Apply the latest Keycloak update or apply the vendor patch once released", "Restrict outbound traffic from the Keycloak instance, e.g., block 169.254.169.254 with firewall rules", "Validate that all sector_identifier_uri values resolve only to trusted external URLs and do not contain redirects to internal resources", "Monitor outbound network connections from the Keycloak server for unexpected requests", "Review and harden client configuration settings regularly"], "summary": {"action": "Apply Patch", "impact": "Server\u2011side request forgery enabling internal resource access"}, "threat_synthesis": {"affected_systems": "The vulnerability impacts Red\u00a0Hat Build of Keycloak, Red\u00a0Hat JBoss Enterprise Application Platform\u00a08, Red\u00a0Hat JBoss Enterprise Application Platform Expansion Pack, and Red\u00a0Hat Single Sign\u2011On\u00a07. No specific version range is supplied; all affected variants are listed in the CNA product list.", "description_and_impact": "A flaw in Keycloak prohibits proper validation of HTTP redirects during client configuration processing. When an attacker supplies a malicious redirect URL, the server follows it and contacts targeted internal or restricted resources. The breach can result in the disclosure of sensitive internal information, such as cloud metadata, and allow attackers to map internal network infrastructure.", "risk_and_exploitability": "The CVSS base score is 5.8, indicating moderate severity, and the EPSS score is less than 1%, suggesting a low likelihood of widespread exploitation. The issue is not listed in the CISA KEV catalog. The likely attack vector is a blind server\u2011side request forgery triggered by HTTP redirect handling, with minimal prerequisites other than the ability to influence client configuration requests."}}}}, "created": "2026-03-18T10:41:50.773291+00:00", "updated": "2026-04-02T08:00:05.398897+00:00", "vendors": ["redhat", "redhat$PRODUCT$build_keycloak", "redhat$PRODUCT$build_of_keycloak", "redhat$PRODUCT$jboss_enterprise_application_platform", "redhat$PRODUCT$jboss_enterprise_application_platform_expansion_pack", "redhat$PRODUCT$red_hat_single_sign_on"]}