Snipe-IT vulnerable to stored XSS via inline-served attachment
The advisory, in context
Impact
A low-privilege user can store an active-content payload as an asset attachment and have it served inline, same-origin, with an active Content-Type, achieving stored XSS. The application sanitizes uploads only when PHP finfo detects image/svg+xml. By submitting an XHTML document whose finfo MIME is text/xml (an allowed extension), the svg-sanitize branch is skipped, the <script> is stored raw, and the inline-serve path returns it as text/xml; charset=utf-8 with Content-Disposition: inline — which the browser renders as a live XHTML document and executes. The dedicated StorageHelper::allowSafeInline() whitelist that should have constrained inline-renderable types is never wired into the serve path.
Details
Vulnerable code — sanitizer keyed on finfo MIME app/Http/Requests/UploadFileRequest.php:46-53
$extension = $file->getClientOriginalExtension();
$file_name = $name_prefix.'-'.str_random(8).'-'.str_slug(...).'.'.$file->guessExtension();
...
if ($file->getMimeType() === 'image/svg+xml') {
$uploaded_file = $this->handleSVG($file); // svg-sanitize fires
} else {
$uploaded_file = file_get_contents($file); // stored RAW — no sanitization
}
Vulnerable code — inline serve, no allowSafeInline() app/Http/Controllers/UploadedFilesController.php:103
if (request('inline') == 'true') {
$headers = ['Content-Disposition' => 'inline'];
return Storage::download($path.$log->filename, $log->filename, $headers);
}
StorageHelper::allowSafeInline() (app/Helpers/StorageHelper.php:88) exists to whitelist inline-renderable types but is not called here. The validation rule (UploadFileRequest::rules()) is mimes: over config('filesystems.allowed_upload_extensions_for_validator'), which includes svg, xml, and txt — so a text/xml file passes validation and bypasses the SVG sanitizer simultaneously.
POC
- From a fresh install, as a user with only
assets.view+assets.filestargeting any existing asset created by admin - click on the asset created by admin and upload files.
- create a XML file with the following payload and upload it.
<?xml version="1.0"?>
<html xmlns="http://www.w3.org/1999/xhtml">
<head><script>alert(document.cookie)</script></head>
<body>hi</body>
</html>
- Noticed that it did not receive any error and the file was uploaded.
- Now, can just get the URL and view it. (need to add the
inline=true). image.png
Notice that the XSS was able to request document.cookie. This means that it is possible for low privilege user to perform XSS and perform privilege escalation to admin.
Affected packages
Start with the recorded fix for your release branch. Check your installed version and test compatibility before upgrading. Fixing this advisory does not rule out other vulnerabilities in the release.
Earlier releases before 8.6.2
Fixed in 8.6.2
278 explicitly affected versions
3.2.0, v0.1.0, v0.1.1, v0.1.2, v0.2.0, v0.3.0-alpha, v0.3.10-alpha, v0.3.11-alpha, v0.3.7-alpha, v0.3.8-alpha, v0.3.9-alpha, v1.0, v1.1, v1.2.0, v1.2.1, v1.2.10, v1.2.11, v1.2.2, v1.2.3, v1.2.3-beta, v1.2.4, v1.2.4-beta, v1.2.5, v1.2.6, v1.2.6-beta, v1.2.6.1, v1.2.7, v1.2.7-beta, v1.2.8, v1.2.9, v2.0, v2.0-RC-1, v2.0-beta, v2.0.1, v2.0.2, v2.0.3, v2.0.4, v2.0.5, v2.0.6, v2.1.0, v2.1.1, v2.1.2, v3.0, v3.0-alpha, v3.0-alpha2, v3.0-beta.1, v3.0-beta.2, v3.0-beta.3, v3.0.0-beta, v3.1.0, v3.3.0, v3.3.0-beta, v3.4, v3.4.0-alpha, v3.4.0-beta, v3.5.0, v3.5.0-beta, v3.5.0-beta2, v3.5.1, v3.5.2, v3.6.0, v3.6.1, v3.6.2, v3.6.3, v3.6.4, v3.6.5, v3.6.6, v4-beta3, v4-beta4, v4.0, v4.0-alpha, v4.0-alpha-2, v4.0-beta, v4.0-beta2, v4.0-beta5, v4.0-beta6, v4.0.1, v4.0.10, v4.0.11, v4.0.12, v4.0.13, v4.0.14, v4.0.15, v4.0.2, v4.0.3, v4.0.4, v4.0.5, v4.0.6, v4.0.7, v4.0.8, v4.0.9, v4.1.0, v4.1.0-beta, v4.1.0-beta2, v4.1.1, v4.1.10, v4.1.11, v4.1.12, v4.1.13, v4.1.14, v4.1.2, v4.1.3, v4.1.4, v4.1.5, v4.1.6, v4.1.7, v4.1.8, v4.1.9, v4.2.0, v4.3.0, v4.4.0, v4.4.1, v4.5.0, v4.6.0, v4.6.1, v4.6.10, v4.6.11, v4.6.12, v4.6.13, v4.6.14, v4.6.15, v4.6.16, v4.6.17, v4.6.18, v4.6.2, v4.6.3, v4.6.4, v4.6.5, v4.6.6, v4.6.7, v4.6.8, v4.6.9, v4.7.0, v4.7.1, v4.7.2, v4.7.3, v4.7.4, v4.7.5, v4.7.6, v4.7.7, v4.7.8, v4.8.0, v4.9.0, v4.9.1, v4.9.2, v4.9.3, v4.9.4, v4.9.5, v5.0.0, v5.0.0-beta-1.0, v5.0.0-beta-1.1, v5.0.0-beta-2, v5.0.0-beta-3.0, v5.0.0-beta-4, v5.0.0-beta-5, v5.0.1, v5.0.10, v5.0.11, v5.0.12, v5.0.2, v5.0.3, v5.0.4, v5.0.5, v5.0.6, v5.0.7, v5.0.8, v5.0.9, v5.1.0, v5.1.1, v5.1.2, v5.1.3, v5.1.4, v5.1.5, v5.1.6, v5.1.7, v5.1.8, v5.2.0, v5.3.0, v5.3.1, v5.3.10, v5.3.2, v5.3.3, v5.3.4, v5.3.5, v5.3.6, v5.3.7, v5.3.8, v5.3.9, v5.4.0, v5.4.1, v5.4.2, v5.4.3, v5.4.4, v6.0.0, v6.0.0-RC-1, v6.0.0-RC-2, v6.0.0-RC-3, v6.0.0-RC-4, v6.0.0-RC-5, v6.0.0-RC-6, v6.0.0-RC-7, v6.0.0-RC-8, v6.0.1, v6.0.10, v6.0.11, v6.0.12, v6.0.13, v6.0.14, v6.0.2, v6.0.3, v6.0.4, v6.0.5, v6.0.6, v6.0.7, v6.0.8, v6.0.9, v6.1.0, v6.1.1, v6.1.2, v6.2.0, v6.2.1, v6.2.2, v6.2.3, v6.3.0, v6.3.1, v6.3.2, v6.3.3, v6.3.4, v6.4.0, v6.4.1, v6.4.2, v7.0.0, v7.0.1, v7.0.10, v7.0.11, v7.0.12, v7.0.13, v7.0.2, v7.0.3, v7.0.4, v7.0.5, v7.0.6, v7.0.7, v7.0.8, v7.0.9, v7.1.14, v7.1.15, v7.1.16, v7.1.17, v8.0.0, v8.0.1, v8.0.2, v8.0.3, v8.0.4, v8.1.0, v8.1.1, v8.1.15, v8.1.16, v8.1.17, v8.1.18, v8.1.2, v8.1.3, v8.1.4, v8.2.0, v8.2.1, v8.3.0, v8.3.1, v8.3.2, v8.3.3, v8.3.4, v8.3.5, v8.3.6, v8.3.7, v8.4.0, v8.4.1, v8.5.0, v8.6.0, v8.6.1
View affected-version evidence
{
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "8.6.2"
}
],
"type": "ECOSYSTEM"
}
],
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]
}References
- https://github.com/grokability/snipe-it/security/advisories/GHSA-jhph-5q74-pmfx
- https://nvd.nist.gov/vuln/detail/CVE-2026-55466
- https://github.com/grokability/snipe-it/commit/000cea0a622d586366cf60d2240c7c2a4b17c955
- https://github.com/grokability/snipe-it
- https://github.com/grokability/snipe-it/releases/tag/v8.6.2