CVE-2026-48013: Shopware SSRF Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-gq96-5pfx-f4vc",
  "modified" : "2026-06-04T19:36:07Z",
  "published" : "2026-06-04T19:36:07Z",
  "aliases" : [ "CVE-2026-48013" ],
  "summary" : "Shopware: SSRF in Media External-Link Endpoint Bypasses IP Validation",
  "details" : "## Summary\n\nThe `/api/_action/media/external-link` endpoint allows authenticated admin users to make server-side HTTP HEAD requests to arbitrary internal IP addresses. While the parallel `uploadFromURL` flow validates target IPs against private/reserved ranges via `FileUrlValidator`, the `linkURL` flow only performs a URL format check (regex for `http://` or `https://` prefix), allowing SSRF to internal network services and cloud metadata endpoints.\n\n## Details\n\nThe vulnerability is an inconsistency between two URL-handling flows in `MediaUploadService`.\n\n**Vulnerable path** (`external-link`):\n\n`MediaUploadV2Controller::externalLink()` at `src/Core/Content/Media/Api/MediaUploadV2Controller.php:66` takes a user-supplied `url` parameter and passes it to `MediaUploadService::linkURL()` at `src/Core/Content/Media/Upload/MediaUploadService.php:134`.\n\n`linkURL()` calls `getContentSizeFromValidExternalUrl($url)` at line 159, which only validates via `validateExternalUrl()`:\n\n```php\n// src/Core/Content/Media/Upload/MediaUploadService.php:207-212\npublic static function validateExternalUrl(string $url): void\n{\n    if (!preg_match('/^https?:\\/\\/.+/', $url)) {\n        throw MediaException::invalidUrl($url);\n    }\n}\n```\n\nThen makes a server-side HEAD request with no IP filtering:\n\n```php\n// src/Core/Content/Media/Upload/MediaUploadService.php:292-300\nprivate function getContentSizeFromValidExternalUrl(string $url): int\n{\n    $this->validateExternalUrl($url);\n\n    $headers = $this->httpClient->request('HEAD', $url)->getHeaders();\n    if (!\\array_key_exists('content-length', $headers)) {\n        throw MediaException::fileNotFound($url);\n    }\n\n    return (int) $headers['content-length'][0];\n}\n```\n\n**Protected path** (`upload_by_url`):\n\nIn contrast, `uploadFromURL` uses `FileFetcher::fetchFromURL()` which calls `FileUrlValidator::isValid()`:\n\n```php\n// src/Core/Content/Media/File/FileFetcher.php:64\nif ($this->enableUrlValidation && !$this->fileUrlValidator->isValid($url)) {\n    throw MediaException::illegalUrl($url);\n}\n```\n\n`FileUrlValidator::isValid()` resolves the hostname via `gethostbyname()` and validates the IP against private and reserved ranges using `filter_var()` with `FILTER_FLAG_NO_PRIV_RANGE | FILTER_FLAG_NO_RES_RANGE`. This protection is entirely absent from the `linkURL` flow.\n\n## Impact\n\nAn authenticated admin user can:\n\n1. **Probe cloud metadata services** — HEAD requests to `169.254.169.254` reveal whether cloud metadata endpoints exist and leak content-length values\n2. **Scan internal networks** — Differentiate open/closed/filtered ports on internal hosts (10.x, 172.16.x, 192.168.x) based on response timing and error types\n3. **Leak internal service information** — The `fileSize` field stored in the database reflects the `content-length` header from internal services\n4. **Redirect-based escalation** — Symfony HttpClient follows redirects by default (max_redirects=20), allowing an attacker-controlled external server to redirect the HEAD request to arbitrary internal destinations\n\nImpact is limited to information disclosure via HEAD requests. The admin authentication requirement (PR:H) reduces exploitability, but in multi-tenant or compromised-credential scenarios this allows network reconnaissance from the server's perspective.\n\n## Recommended Fix\n\nApply `FileUrlValidator` to the `linkURL` flow, consistent with the `uploadFromURL` flow. In `MediaUploadService`:\n\n```php\n// src/Core/Content/Media/Upload/MediaUploadService.php\n\n// Add constructor dependency:\nprivate readonly FileUrlValidatorInterface $fileUrlValidator;\n\n// In getContentSizeFromValidExternalUrl(), add IP validation:\nprivate function getContentSizeFromValidExternalUrl(string $url): int\n{\n    $this->validateExternalUrl($url);\n\n    if (!$this->fileUrlValidator->isValid($url)) {\n        throw MediaException::illegalUrl($url);\n    }\n\n    $headers = $this->httpClient->request('HEAD', $url)->getHeaders();\n    if (!\\array_key_exists('content-length', $headers)) {\n        throw MediaException::fileNotFound($url);\n    }\n\n    return (int) $headers['content-length'][0];\n}\n```\n\nAdditionally, consider setting `max_redirects: 0` on the HttpClient request to prevent redirect-based SSRF bypasses.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "shopware/core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "6.7.0.0"
      }, {
        "fixed" : "6.7.10.1"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "shopware/platform"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "6.7.0.0"
      }, {
        "fixed" : "6.7.10.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/shopware/shopware/security/advisories/GHSA-gq96-5pfx-f4vc"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/shopware/shopware"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/shopware/shopware/releases/tag/v6.7.10.1"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-918" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-06-04T19:36:07Z",
    "nvd_published_at" : null
  }
}