CVE-2026-55791

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{"affected": [{"affectedData": [{"product": "cms", "vendor": "craftcms", "versions": [{"status": "affected", "version": ">= 5.0.0-RC1, < 5.10.0"}, {"status": "affected", "version": ">= 4.0.0-RC1, < 4.18.0"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Craft CMS is a content management system (CMS). Versions 4.0.0-RC1 and above, prior to 4.18.0 and 5.0.0-RC1, and above, prior to 5.10.0, are vulnerable to Server-Side Request Forgery (SSRF) and Arbitrary JavaScript Injection through the /actions/app/resource-js endpoint. By exploiting the default permissive trustedHosts configuration, an attacker can poison the Host or X-Forwarded-Host header to manipulate the application\u2019s $baseUrl. This bypasses the endpoint\u2019s internal URL validation, forcing the backend Guzzle client to fetch a malicious payload from an attacker-controlled server and reflect it to the client with a Content-Type: application/javascript header. The vulnerability manifests when assetManager.cacheSourcePaths is set to false. This issue has been fixed in versions 4.18.0 and 5.10.0."}, {"lang": "es", "value": "Craft CMS es un sistema de gesti\u00f3n de contenido (CMS). Las versiones 4.0.0-RC1 y superiores, anteriores a la 4.18.0, y 5.0.0-RC1 y superiores, anteriores a la 5.10.0, son vulnerables a la falsificaci\u00f3n de petici\u00f3n del lado del servidor (SSRF) e inyecci\u00f3n arbitraria de JavaScript a trav\u00e9s del endpoint /actions/app/resource-js. Al explotar la configuraci\u00f3n permisiva predeterminada de trustedHosts, un atacante puede envenenar la cabecera Host o X-Forwarded-Host para manipular el $baseUrl de la aplicaci\u00f3n. Esto elude la validaci\u00f3n interna de URL del endpoint, forzando al cliente Guzzle del backend a obtener una carga \u00fatil maliciosa de un servidor controlado por el atacante y reflejarla al cliente con una cabecera Content-Type: application/javascript. La vulnerabilidad se manifiesta cuando assetManager.cacheSourcePaths se establece en false. Este problema ha sido solucionado en las versiones 4.18.0 y 5.10.0."}], "id": "CVE-2026-55791", "lastModified": "2026-10-25T21:10:00.770", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 6.9, "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": "NONE", "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:N/UI:N/VC:L/VI:N/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": "LOW", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-55791", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-07-02T14:53:40.361993Z", "version": "2.0.3"}}]}, "published": "2026-07-02T00:16:44.803", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/craftcms/cms/pull/18559"}, {"source": "security-advisories@github.com", "url": "https://github.com/craftcms/cms/security/advisories/GHSA-c55v-343g-5xff"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-79"}, {"lang": "en", "value": "CWE-644"}, {"lang": "en", "value": "CWE-918"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

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