Falhas do tipo CWE-434

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Upload irrestrito de arquivo com tipo perigoso

A aplicação aceita upload de arquivos sem validar adequadamente o tipo ou extensão, permitindo que um atacante envie executáveis, scripts ou outros arquivos maliciosos que serão armazenados ou executados no servidor. O risco aumenta se o arquivo for salvo em diretório acessível pela web ou em local onde será processado automaticamente.

Exemplo

Um sistema de upload de 'fotos de perfil' verifica apenas o tamanho do arquivo, mas não valida a extensão. Um atacante envia um arquivo .php disfarçado de imagem; se salvo em /uploads/ acessível via web, ele consegue executar código PHP no servidor ao acessar a URL direta.

Como mitigar

Valide extensões contra uma lista branca (whitelist) de tipos permitidos, verifique a assinatura do arquivo (magic bytes) e não confie apenas no Content-Type do cliente. Armazene uploads fora do diretório web ou configure o servidor para não executar scripts no diretório de uploads.

CVE-2024-4349HIGHSourceCodester Pisay Online E-Learning System controller.php unrestricted uploadEPSS 1.0%CVE-2024-50427CRITICALWordPress SurveyJS plugin <= 1.9.136 - Arbitrary File Upload vulnerabilityEPSS 1.0%CVE-2024-0800HIGHAuthentication Bypass via wizardLogin in Arcserve Unified Data ProtectionEPSS 1.0%CVE-2023-35189CRITICALIagona ScrutisWeb Unrestricted Upload of File with Dangerous TypeEPSS 1.0%CVE-2023-23135HIGHAn arbitrary file upload vulnerability in Ftdms v3.1.6 allows attackers to execute arbitrary code via uploading a crafted JPG file.EPSS 1.0%CVE-2023-29268CRITICALTIBCO Spotfire Statistics Services Unrestricted File Upload VulnerabilityEPSS 1.0%CVE-2026-104800CRITICALAGE-GATE <= 1.0 - Unauthenticated Remote Code Execution via PHP Code Injection via 'width'/'height' Parameters to Standalone admin.phpEPSS 1.0%CVE-2025-7443HIGHBerqWP <= 2.2.42 - Unauthenticated Arbitrary File UploadEPSS 1.0%CVE-2024-6828HIGHRedux Framework 4.4.12 - 4.4.17 - Unauthenticated JSON File Upload to Stored Cross-Site ScriptingEPSS 1.0%CVE-2025-67886MEDIUMBitrix24 through 25.100.300 allows Remote Code Execution because an actor with SOURCE/WRITE permissions for the Translate Module can upload EPSS 1.0%CVE-2026-14489HIGHWHMCS Bridge <= 6.9 - Unauthenticated Arbitrary File Upload via 'ccce' ParameterEPSS 1.0%CVE-2026-14498HIGHQuery Wrangler <= 1.5.57 - Authenticated (Subscriber+) Remote Code Execution via 'options' ParameterEPSS 1.0%CVE-2026-23636MEDIUMKiteworks Secure Data Forms is vulnerable to an Unrestricted Upload of File with Dangerous TypeEPSS 1.0%CVE-2023-1415MEDIUMSimple Art Gallery adminHome.php sliderPicSubmit unrestricted uploadEPSS 1.0%CVE-2026-15965HIGHMaxUpload <= 1.4.0 - Unauthenticated Arbitrary File Upload via 'resumableFilename' ParameterEPSS 1.0%CVE-2023-39377HIGH SiberianCMS - CWE-434: Unrestricted Upload of File with Dangerous Type - A malicious user with administrative privileges may be able to upload a dangerous filetype via an unspecified methodEPSS 1.0%CVE-2026-61524HIGHWebsiteBaker CMS < 2.13.10 File Upload RCE via Module InstallationEPSS 1.0%CVE-2024-4397HIGHLearnPress – WordPress LMS Plugin <= 4.2.6.5 - Authenticated (Instructor+) Arbitrary File UploadEPSS 1.0%CVE-2023-30613HIGHKiwi TCMS unrestricted file upload vulnerabilityEPSS 1.0%CVE-2023-38029CRITICALSaho ADM100&ADM-100FP - Arbitrary File UploadEPSS 1.0%