Vulnerability Description
Sharp is a content management framework built for Laravel as a package. Versions prior to 9.20.0 contain a vulnerability in the file upload endpoint that allows authenticated users to bypass all file type restrictions. The upload endpoint within the `ApiFormUploadController` accepts a client-controlled `validation_rule` parameter. This parameter is directly passed into the Laravel validator without sufficient server-side enforcement. By intercepting the request and sending `validation_rule[]=file`, an attacker can completely bypass all MIME type and file extension restrictions. This issue has been addressed in version 9.20.0 by removing the client-controlled validation rules and strictly defining upload rules server-side. As a workaround, ensure that the storage disk used for Sharp uploads is strictly private. Under default configurations, an attacker cannot directly execute uploaded PHP files unless a public disk configuration is explicitly used.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Code16 | Sharp | < 9.20.0 |
Related Weaknesses (CWE)
References
- https://github.com/code16/sharp/pull/714Issue TrackingPatch
- https://github.com/code16/sharp/releases/tag/v9.20.0Product
- https://github.com/code16/sharp/security/advisories/GHSA-fr76-5637-w3g9Vendor Advisory
- https://laravel.com/docs/13.x/filesystemThird Party Advisory
FAQ
What is CVE-2026-33687?
CVE-2026-33687 is a vulnerability with a CVSS score of 8.8 (HIGH). Sharp is a content management framework built for Laravel as a package. Versions prior to 9.20.0 contain a vulnerability in the file upload endpoint that allows authenticated users to bypass all file ...
How severe is CVE-2026-33687?
CVE-2026-33687 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-33687?
Check the references section above for vendor advisories and patch information. Affected products include: Code16 Sharp.