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CVE-2026-33687— Sharp has Unrestricted File Upload via Client-Controlled Validation Rules

Quick assessment

Affected
code16 sharp
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

sharp是lovell个人开发者的一款用于将常见格式的大图像转换为更小的、对 Web 友好的 JPEG、PNG、WebP、GIF 和不同尺寸的 AVIF 图像。 Sharp 9.20.0之前版本存在代码问题漏洞，该漏洞源于文件上传端点存在客户端控制的validation_rule参数，可能导致绕过所有文件类型限制。

CVSS 8.8 · High EPSS 0.69% · P52

Possible ATT&CK Techniques 1 AI

T1505.003 · Web Shell
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I. Basic Information for CVE-2026-33687

Vulnerability Information
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Vulnerability Title
Sharp has Unrestricted File Upload via Client-Controlled Validation Rules
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
危险类型文件的不加限制上传
Source: CVE Program / CVE List V5
Vulnerability Title
sharp 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
sharp是lovell个人开发者的一款用于将常见格式的大图像转换为更小的、对 Web 友好的 JPEG、PNG、WebP、GIF 和不同尺寸的 AVIF 图像。 Sharp 9.20.0之前版本存在代码问题漏洞，该漏洞源于文件上传端点存在客户端控制的validation_rule参数，可能导致绕过所有文件类型限制。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
code16 sharp < 9.20.0 -

II. Public POCs for CVE-2026-33687

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III. Intelligence Information for CVE-2026-33687

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Patches & Fixes for CVE-2026-33687 (2)

Vendor Advisories for CVE-2026-33687 (1)

Vendor Pages for CVE-2026-33687 (1)

IV. Related Vulnerabilities

Same product: sharp
Same vendor: code16
Same weakness: CWE-434

V. Comments for CVE-2026-33687

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