{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-55791", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-06-17T14:40:28.380Z", "datePublished": "2026-07-01T23:13:58.321Z", "dateUpdated": "2026-07-01T23:13:58.321Z"}, "containers": {"cna": {"title": "Craft CMS: Blind SSRF and Arbitrary JavaScript Injection via Host Header Poisoning in actionResourceJs", "problemTypes": [{"descriptions": [{"cweId": "CWE-918", "lang": "en", "description": "CWE-918: Server-Side Request Forgery (SSRF)", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-644", "lang": "en", "description": "CWE-644: Improper Neutralization of HTTP Headers for Scripting Syntax", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-79", "lang": "en", "description": "CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')", "type": "CWE"}]}], "metrics": [{"cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 6.9, "baseSeverity": "MEDIUM", "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", "version": "4.0"}}], "references": [{"name": "https://github.com/craftcms/cms/security/advisories/GHSA-c55v-343g-5xff", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/craftcms/cms/security/advisories/GHSA-c55v-343g-5xff"}, {"name": "https://github.com/craftcms/cms/pull/18559", "tags": ["x_refsource_MISC"], "url": "https://github.com/craftcms/cms/pull/18559"}], "affected": [{"vendor": "craftcms", "product": "cms", "versions": [{"version": ">= 5.0.0-RC1, < 5.10.0", "status": "affected"}, {"version": ">= 4.0.0-RC1, < 4.18.0", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-07-01T23:13:58.321Z"}, "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."}], "source": {"advisory": "GHSA-c55v-343g-5xff", "discovery": "UNKNOWN"}}}}

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