CVE-2026-33687

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{"affected": [{"affectedData": [{"product": "sharp", "vendor": "code16", "versions": [{"status": "affected", "version": "< 9.20.0"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:code16:sharp:*:*:*:*:*:*:*:*", "matchCriteriaId": "0D710527-04D5-4152-A28C-506356B95CE1", "versionEndExcluding": "9.20.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}, {"lang": "es", "value": "Sharp es un framework de gesti\u00f3n de contenido construido para Laravel como un paquete. Las versiones anteriores a la 9.20.0 contienen una vulnerabilidad en el endpoint de carga de archivos que permite a los usuarios autenticados eludir todas las restricciones de tipo de archivo. El endpoint de carga dentro del `ApiFormUploadController` acepta un par\u00e1metro `validation_rule` controlado por el cliente. Este par\u00e1metro se pasa directamente al validador de Laravel sin una aplicaci\u00f3n suficiente por parte del servidor. Al interceptar la solicitud y enviar `validation_rule[]=file`, un atacante puede eludir completamente todas las restricciones de tipo MIME y de extensi\u00f3n de archivo. Este problema se ha abordado en la versi\u00f3n 9.20.0 eliminando las reglas de validaci\u00f3n controladas por el cliente y definiendo estrictamente las reglas de carga en el lado del servidor. Como soluci\u00f3n alternativa, aseg\u00farese de que el disco de almacenamiento utilizado para las cargas de Sharp sea estrictamente privado. Bajo las configuraciones predeterminadas, un atacante no puede ejecutar directamente archivos PHP cargados a menos que se utilice expl\u00edcitamente una configuraci\u00f3n de disco p\u00fablico."}], "id": "CVE-2026-33687", "lastModified": "2026-06-17T10:37:55.620", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.9, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-33687", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-03-27T20:28:24.566534Z", "version": "2.0.3"}}]}, "published": "2026-03-26T22:16:31.203", "references": [{"source": "security-advisories@github.com", "tags": ["Issue Tracking", "Patch"], "url": "https://github.com/code16/sharp/pull/714"}, {"source": "security-advisories@github.com", "tags": ["Product"], "url": "https://github.com/code16/sharp/releases/tag/v9.20.0"}, {"source": "security-advisories@github.com", "tags": ["Vendor Advisory"], "url": "https://github.com/code16/sharp/security/advisories/GHSA-fr76-5637-w3g9"}, {"source": "security-advisories@github.com", "tags": ["Third Party Advisory"], "url": "https://laravel.com/docs/13.x/filesystem"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-434"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,9.20.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "sharp", "source": "cna", "vendor": "code16"}, "product": "sharp", "vendor": "code16"}], "analysis": {"en": {"generated_at": "2026-04-02T22:13:49.052950+00:00", "value": {"mitigation_remediation": ["Update Sharp to version 9.20.0 or later, which removes client\u2011controlled validation rules and enforces server\u2011side restrictions.", "If a patch cannot be applied immediately, configure Sharp to store uploads on a strictly private disk so that uploaded files cannot be accessed or executed from the web.", "Audit existing uploaded files for unexpected extensions or MIME types.", "Monitor upload activity logs for suspicious patterns and block anomalous requests.", "Verify that the server\u2019s file system permissions prevent execution of uploaded content on all disks."], "summary": {"action": "Immediate Patch", "impact": "Unrestricted File Upload"}, "threat_synthesis": {"affected_systems": "The affected product is Code16 Sharp, a Laravel package used for content management. All Sharp installations running versions older than 9.20.0 are vulnerable. The issue arises in the ApiFormUploadController handling file uploads.", "description_and_impact": "Sharp versions before 9.20.0 allow an authenticated user to upload any file type because the client specifies a validation_rule parameter that bypasses the server\u2011side file type checks. By sending validation_rule[]=file the attacker can override MIME type and extension restrictions, potentially placing malicious files on the server. If the upload disk is publicly accessible, this could lead to code execution; if it is private, the files remain non\u2011executable but still expose the system to further compromise.", "risk_and_exploitability": "The CVSS score of 8.8 classifies this vulnerability as high severity. The EPSS score of less than one percent indicates low current exploitation probability, and it is not listed in the CISA KEV catalog. Exploitation requires authenticated access to the upload endpoint, but the lack of server\u2011side restriction makes it straightforward once access is obtained. If uploads are saved to a publicly reachable disk, the risk of remote code execution rises significantly. Until a patch is applied, administrators should treat the vulnerability as a serious concern."}}}}, "created": "2026-03-27T08:31:36.680428+00:00", "updated": "2026-04-03T09:38:47.267662+00:00", "vendors": ["code16", "code16$PRODUCT$sharp"]}