Sharp has Unrestricted File Upload via Client-Controlled Validation Rules_CVE-2026-33687

{
    "lastseen": "",
    "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.",
    "published": "2026-03-26T21:47:55.573Z",
    "modified": "2026-03-27T20:28:53.385Z",
    "type": "cve",
    "title": "Sharp has Unrestricted File Upload via Client-Controlled Validation Rules",
    "source": "GitHub_M",
    "references": "https://github.com/code16/sharp/security/advisories/GHSA-fr76-5637-w3g9\nhttps://github.com/code16/sharp/pull/714\nhttps://github.com/code16/sharp/releases/tag/v9.20.0\nhttps://laravel.com/docs/13.x/filesystem",
    "id": "CVE-2026-33687",
    "bulletinFamily": "",
    "cwe": [
        "CWE-434"
    ],
    "cvelist": null,
    "sourceData": "code16 sharp < 9.20.0",
    "sourceHref": "",
    "cvss": {
        "score": 8.8,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
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        "baseScore": 0,
        "baseSeverity": "",
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        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
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            "baseScore": 0,
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        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "sharp",
    "version": "< 9.20.0",
    "vendor": "code16",
    "ai_description": "",
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    "ai_score": 0
}