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-2024-1986HIGHElite Booster for WooCommerce <= 7.1.7 - Authenticated (Subscriber+) Arbitrary File UploadEPSS 1.3%CVE-2024-14037CRITICALRedsea Cloud eHR Unauthenticated File Upload RCE via PtFjk.mobEPSS 1.3%CVE-2024-29514HIGHFile Upload vulnerability in lepton v.7.1.0 allows a remote authenticated attackers to execute arbitrary code via uploading a crafted PHP fiEPSS 1.3%CVE-2023-27168CRITICALAn arbitrary file upload vulnerability in Xpand IT Write-back Manager v2.3.1 allows attackers to execute arbitrary code via a crafted jsp fiEPSS 1.3%CVE-2026-42322CRITICALPiwigo: Authenticated RCE via File Upload in Logo Upload FeatureEPSS 1.3%CVE-2020-20588HIGHFile upload vulnerability in function upload in action/Core.class.php in zhimengzhe iBarn 1.5 allows remote attackers to run arbitrary code EPSS 1.3%CVE-2023-6636HIGHGreenshift – animation and page builder blocks <= 7.6.2 - Authenticated (Administrator+) Arbitrary File UploadEPSS 1.3%CVE-2019-10935—A vulnerability has been identified in SIMATIC PCS 7 V8.0 and earlier (All versions), SIMATIC PCS 7 V8.1 (All versions < V8.1 with WinCC V7.EPSS 1.3%CVE-2023-6826HIGHE2Pdf <= 1.20.25 - Authenticated (Administrator+) Arbitrary File UploadEPSS 1.3%CVE-2021-33009HIGHmySCADA myPRO Unrestricted Upload of File with Dangerous TypeEPSS 1.3%CVE-2022-44053CRITICALThe d8s-networking for python, as distributed on PyPI, included a potential code-execution backdoor inserted by a third party. A potential cEPSS 1.3%CVE-2023-6827HIGHEssential Real Estate <= 4.3.5 - Authenticated (Subscriber+) Arbitrary File UploadEPSS 1.3%CVE-2025-6586HIGHDownload Plugin <= 2.2.8 - Authenticated (Administrator+) Arbitrary File UploadEPSS 1.3%CVE-2020-21325HIGHAn issue in WUZHI CMS v.4.1.0 allows a remote attacker to execute arbitrary code via the set_chache method of the function\common.func.php fEPSS 1.3%CVE-2020-20067HIGHFile upload vulnerability in ebCMS v.1.1.0 allows a remote attacker to execute arbitrary code via the upload type parameter.EPSS 1.3%CVE-2025-4468MEDIUMSourceCodester Online Student Clearance System edit-photo.php unrestricted uploadEPSS 1.3%CVE-2026-48276CRITICALColdFusion | Unrestricted Upload of File with Dangerous Type (CWE-434)EPSS 1.3%CVE-2026-48283CRITICALColdFusion | Unrestricted Upload of File with Dangerous Type (CWE-434)EPSS 1.3%CVE-2021-32961HIGHMDT AutoSave Unrestricted Upload of File with Dangerous TypeEPSS 1.3%CVE-2022-2111CRITICALUnrestricted Upload of File with Dangerous Type in inventree/inventreeEPSS 1.3%