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CVE-2026-55791— Craft CMS: Blind SSRF and Arbitrary JavaScript Injection via Host Header Poisoning in actionResourceJs

AI Predicted 8.5 Difficulty: Easy
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I. Basic Information for CVE-2026-55791

Vulnerability Information
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Vulnerability Title
Craft CMS: Blind SSRF and Arbitrary JavaScript Injection via Host Header Poisoning in actionResourceJs
Source: NVD (National Vulnerability Database)
Vulnerability Description
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’s $baseUrl. This bypasses the endpoint’s 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: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
服务端请求伪造(SSRF)
Source: NVD (National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
craftcmscms >= 5.0.0-RC1, < 5.10.0 -

II. Public POCs for CVE-2026-55791

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III. Intelligence Information for CVE-2026-55791

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Patches & Fixes for CVE-2026-55791 (1)

Vendor Advisories for CVE-2026-55791 (1)

Same Patch Batch · craftcms · 2026-07-01 · 9 CVEs total

CVE-2026-50284Craft CMS: Missing peer-permission check in `AssetsController::actionDeleteFolder` allows
CVE-2026-50280Craft CMS: Authorization bypass in `entries/move-to-section` via missing target-section sa
CVE-2026-50279Craft CMS: Authorship spoofing in `entries/save-entry` via pre-check/post-mutation authori
CVE-2026-50283Craft CMS: Unauthorized Deletion of Source Assets During File Replacement
CVE-2026-55793Craft CMS: Stored XSS via Structure entry title in table view
CVE-2026-55790Craft CMS: DOM XSS via GitHub issue title in CraftSupport widget
CVE-2026-55792Craft CMS: Sensitive File Disclosure / Server-Side File Read
CVE-2026-55794Craft CMS: Potential authenticated Remote Code Execution via referrer redirect

IV. Related Vulnerabilities

Same product: cms
Same vendor: craftcms
Same weakness: CWE-918

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