CVE-2026-25498

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In versions 4.0.0-RC1 through 4.16.17 and 5.0.0-RC1 through 5.8.21, a Remote Code Execution (RCE) vulnerability exists in Craft CMS where the assembleLayoutFromPost() function in src/services/Fields.php fails to sanitize user-supplied configuration data before passing it to Craft::createObject(). This allows authenticated administrators to inject malicious Yii2 behavior configurations that execute arbitrary system commands on the server. This vulnerability represents an unpatched variant of the behavior injection vulnerability addressed in CVE-2025-68455, affecting different endpoints through a separate code path. This vulnerability is fixed in 5.8.22."}, {"lang": "es", "value": "Craft es una plataforma para crear experiencias digitales. En las versiones 4.0.0-RC1 hasta la 4.16.17 y 5.0.0-RC1 hasta la 5.8.21, existe una vulnerabilidad de ejecuci\u00f3n remota de c\u00f3digo (RCE) en Craft CMS donde la funci\u00f3n assembleLayoutFromPost() en src/services/Fields.PHP no logra sanear los datos de configuraci\u00f3n proporcionados por el usuario antes de pasarlos a Craft::createObject(). Esto permite a los administradores autenticados inyectar configuraciones de comportamiento maliciosas de Yii2 que ejecutan comandos de sistema arbitrarios en el servidor. Esta vulnerabilidad representa una variante sin parchear de la vulnerabilidad de inyecci\u00f3n de comportamiento abordada en CVE-2025-68455, afectando a diferentes puntos finales a trav\u00e9s de una ruta de c\u00f3digo separada. Esta vulnerabilidad se corrige en la 5.8.22."}], "id": "CVE-2026-25498", "lastModified": "2026-06-17T10:24:44.610", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.2, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "HIGH", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.2, "impactScore": 5.9, "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": 8.6, "baseSeverity": "HIGH", "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": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/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": "HIGH", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-25498", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-02-10T15:32:09.006023Z", "version": "2.0.3"}}]}, "published": "2026-02-09T20:15:58.510", "references": [{"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/craftcms/cms/commit/395c64f0b80b507be1c862a2ec942eaacb353748"}, {"source": "security-advisories@github.com", "tags": ["Release Notes"], "url": "https://github.com/craftcms/cms/releases/tag/5.8.22"}, {"source": "security-advisories@github.com", "tags": ["Exploit", "Patch", "Vendor Advisory"], "url": "https://github.com/craftcms/cms/security/advisories/GHSA-7jx7-3846-m7w7"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-470"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[5.0.0-RC1,5.8.22)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[4.0.0-RC1,4.16.18)"}}], "product": "craftcms", "vendor": "craftcms"}], "analysis": {"en": {"generated_at": "2026-04-17T21:15:10.565753+00:00", "value": {"mitigation_remediation": ["Update Craft CMS to version 5.8.22 or later, which contains the fix for the vulnerability.", "If an upgrade is not immediately possible, limit field configuration editing rights to trusted administrators only and disable the ability to upload or alter behavior configurations where feasible.", "Continuously monitor system logs for unexpected process creation or execution of unfamiliar commands, and review administrator activity logs for suspicious field updates."], "summary": {"action": "Patch Immediately", "impact": "Remote Code Execution"}, "threat_synthesis": {"affected_systems": "Vulnerable versions include Craft CMS 4.0.0-RC1 through 4.16.17 and 5.0.0-RC1 through 5.8.21. The issue was fixed in version 5.8.22. The vulnerability affects any instance where administrators can create or update fields with custom configuration data.", "description_and_impact": "Craft CMS allows authenticated administrators to inject malicious Yii2 behavior configurations when creating or updating fields. The assembleLayoutFromPost() function does not sanitize user-supplied configuration data before passing it to Craft::createObject(), which can lead to arbitrary system command execution on the server. This results in a remote code execution vulnerability that compromises confidentiality, integrity, and availability of the affected installation.", "risk_and_exploitability": "With a CVSS score of 8.6 the vulnerability is considered high severity. The EPSS score is under 1\u202f%, suggesting a low probability of exploitation at this time, and the vulnerability is not listed in CISA\u2019s KEV catalog. However, the flaw requires administrator authentication, so attackers would need valid credentials to exploit it. If acquired, an exploit could allow complete takeover of the web application server."}}}}, "created": "2026-02-10T15:37:26.747220+00:00", "updated": "2026-04-17T21:15:27.393085+00:00", "vendors": ["craftcms", "craftcms$PRODUCT$craftcms"]}