Advisory details:
github_osv / GHSA-jhph-5q74-pmfx
| Advisory ID | github_osv/GHSA-jhph-5q74-pmfx |
| Aliases |
CVE-2026-55466
|
| Summary | Snipe-IT vulnerable to stored XSS via inline-served attachment ### 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` ```php $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` ```php 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 1. From a fresh install, as a user with only `assets.view` + `assets.files` targeting any existing asset created by admin 2. click on the asset created by admin and upload files. 3. create a XML file with the following payload and upload it. ```xml <?xml version="1.0"?> <html xmlns="http://www.w3.org/1999/xhtml"> <head><script>alert(document.cookie)</script></head> <body>hi</body> </html> ``` 4. Noticed that it did not receive any error and the file was uploaded. 5. 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. |
| Status | Published |
| Exploitability | 0.5 |
| Weighted Severity | 7.8 |
| Risk | 3.9 |
| Affected and Fixed Packages | Package Details |
| Introduced and Fixed Package Commit Patches | Package Commit Patches Details |
| System | Score | Found at |
|---|---|---|
| cvssv3.1 | 8.7 | https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-jhph-5q74-pmfx/GHSA-jhph-5q74-pmfx.json |
| cvssv4 | 6.2 | https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-jhph-5q74-pmfx/GHSA-jhph-5q74-pmfx.json |
| generic_textual | MODERATE |
| Reference id | Reference type | URL |
|---|---|---|
| https://github.com/grokability/snipe-it | ||
| 000cea0a622d586366cf60d2240c7c2a4b17c955 | Other | https://github.com/grokability/snipe-it/commit/000cea0a622d586366cf60d2240c7c2a4b17c955 |
| CVE-2026-55466 | https://nvd.nist.gov/vuln/detail/CVE-2026-55466 | |
| GHSA-jhph-5q74-pmfx | Other | https://github.com/grokability/snipe-it/security/advisories/GHSA-jhph-5q74-pmfx |
| v8.6.2 | Other | https://github.com/grokability/snipe-it/releases/tag/v8.6.2 |
No EPSS data available for this advisory.
| Patch URL | |
|---|---|
| There are no known patches. | |
| Attack Vector (AV) | Attack Complexity (AC) | Privileges Required (PR) | User Interaction (UI) | Scope (S) | Confidentiality Impact (C) | Integrity Impact (I) | Availability Impact (A) |
|---|---|---|---|---|---|---|---|
network adjacent_network local physical |
low high |
none low high |
none required |
unchanged changed |
high low none |
high low none |
high low none |
| Attack Vector (AV) | Attack Complexity (AC) | Attack Requirements (AT) | Privileges Required (PR) | User Interaction (UI) | Vulnerable System Impact Confidentiality (VC) | Vulnerable System Impact Integrity (VI) | Vulnerable System Impact Availability (VA) | Subsequent System Impact Confidentiality (SC) | Subsequent System Impact Integrity (SI) | Subsequent System Impact Availability (SA) |
|---|---|---|---|---|---|---|---|---|---|---|
network adjacent local physical |
low high |
none present |
none low high |
none passive active |
high low none |
high low none |
high low none |
high low none |
high low none |
high low none |
Vector: SSVCv2/E:P/A:N/T:P/P:M/B:A/M:M/D:T/2026-07-13T18:22:00Z/
Decision: Track
Source URL: https://github.com/cisagov/vulnrichment/blob/develop/2026/55xxx/CVE-2026-55466.json
Source Advisory: vulnrichment/CVE-2026-55466
[{'Exploitation': 'poc'},
{'Automatable': 'no'},
{'Technical Impact': 'partial'},
{'Mission Prevalence': 'minimal'},
{'Public Well-being Impact': 'material'},
{'Mission & Well-being': 'medium'}]