CVE-2026-3241

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{"affected": [{"affectedData": [{"collectionURL": "https://github.com/concretecms/concretecms", "defaultStatus": "unaffected", "platforms": ["git"], "product": "Concrete CMS", "repo": "https://github.com/concretecms/concretecms", "vendor": "Concrete CMS", "versions": [{"lessThan": "9.4.8", "status": "affected", "version": "5", "versionType": "git"}]}], "source": "ff5b8ace-8b95-4078-9743-eac1ca5451de"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:concretecms:concrete_cms:*:*:*:*:*:*:*:*", "matchCriteriaId": "BCBFD93E-6A10-4E9F-A31E-4A2C1FCD367C", "versionEndExcluding": "9.4.8", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In Concrete CMS below version 9.4.8, a\u00a0stored cross-site scripting (XSS) vulnerability exists in the \"Legacy Form\" block. An authenticated user with permissions to create or edit forms (e.g., a rogue administrator) can inject a persistent JavaScript payload into the options of a multiple-choice question (Checkbox List, Radio Buttons, or Select Box). This payload is then executed in the browser of any user who views the page containing the form.\u00a0The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 4.8 with vector\u00a0CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N. Thanks\u00a0M3dium for reporting."}, {"lang": "es", "value": "En Concrete CMS por debajo de la versi\u00f3n 9.4.8, existe una vulnerabilidad de cross-site scripting (XSS) almacenado en el bloque 'Legacy Form'. Un usuario autenticado con permisos para crear o editar formularios (por ejemplo, un administrador malintencionado) puede inyectar una carga \u00fatil de JavaScript persistente en las opciones de una pregunta de opci\u00f3n m\u00faltiple (Lista de Casillas de Verificaci\u00f3n, Botones de Radio o Cuadro de Selecci\u00f3n). Esta carga \u00fatil se ejecuta entonces en el navegador de cualquier usuario que ve la p\u00e1gina que contiene el formulario. El equipo de seguridad de Concrete CMS otorg\u00f3 a esta vulnerabilidad una puntuaci\u00f3n CVSS v.4.0 de 4.8 con el vector CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N. Gracias M3dium por el informe."}], "id": "CVE-2026-3241", "lastModified": "2026-06-17T10:43:16.480", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 4.8, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "HIGH", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 1.7, "impactScore": 2.7, "source": "nvd@nist.gov", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 4.8, "baseSeverity": "MEDIUM", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "HIGH", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "PASSIVE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "LOW", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "ff5b8ace-8b95-4078-9743-eac1ca5451de", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-3241", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-03-04T15:41:54.660496Z", "version": "2.0.3"}}]}, "published": "2026-03-04T03:16:05.107", "references": [{"source": "ff5b8ace-8b95-4078-9743-eac1ca5451de", "tags": ["Patch", "Release Notes", "Vendor Advisory"], "url": "https://documentation.concretecms.org/9-x/developers/introduction/version-history/948-release-notes"}, {"source": "ff5b8ace-8b95-4078-9743-eac1ca5451de", "tags": ["Exploit", "Issue Tracking", "Vendor Advisory"], "url": "https://github.com/concretecms/concretecms/pull/12826"}], "sourceIdentifier": "ff5b8ace-8b95-4078-9743-eac1ca5451de", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-79"}], "source": "ff5b8ace-8b95-4078-9743-eac1ca5451de", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": ["git"], "status": "affected", "versions": {"scheme": "generic", "value": "[5,9.4.8)"}}], "enrichment": {"confidence": 98.0, "confidence_source": "matching", "scores": [{"score": 98.0, "source": "matching"}]}, "original": {"product": "Concrete CMS", "source": "cna", "vendor": "Concrete CMS"}, "product": "concrete_cms", "vendor": "concretecms"}], "analysis": {"en": {"generated_at": "2026-04-18T10:01:54.209076+00:00", "value": {"mitigation_remediation": ["Upgrade Concrete CMS to version\u202f9.4.8 or later.", "Replace any Legacy Form blocks on public or internal pages with newer form modules or remove the Legacy Form module entirely as a temporary safeguard.", "Limit form\u2011creation and editing permissions to trusted administrators and audit user privileges regularly."], "summary": {"action": "Patch", "impact": "Stored cross\u2011site scripting in the Legacy Form block"}, "threat_synthesis": {"affected_systems": "All releases of Concrete CMS before 9.4.8 are affected. Users on 9.4.8 or later are not impacted. The official fix begins with version 9.4.8 as noted in the vendor\u2019s release notes and pull request documentation.", "description_and_impact": "Concrete CMS versions prior to 9.4.8 allow an authenticated user with form\u2011creation or editing privileges to embed a persistent JavaScript payload into the options of a multiple\u2011choice question in the Legacy Form block. When any user views a page containing that form, the stored script runs in the visitor\u2019s browser. The flaw is a data\u2011injection vulnerability (CWE\u201179) that exposes users to arbitrary client\u2011side code execution but does not provide direct server\u2011side code execution or data exfiltration from the CMS itself.", "risk_and_exploitability": "The CVSS v4.0 score of 4.8 indicates moderate severity. The EPSS score is below 1\u202f%, implying that exploitation is currently unlikely. The vulnerability is not listed in the CISA KEV catalog. Exploitation requires legitimate high\u2011privilege credentials to inject the payload, and the attacker must rely on victims visiting the affected page to trigger the client\u2011side code. No additional system compromise options are disclosed by the vendor or the CVE description."}}}}, "created": "2026-03-04T14:53:19.712861+00:00", "updated": "2026-04-18T10:15:25.863168+00:00", "vendors": ["concretecms", "concretecms$PRODUCT$concrete_cms"]}