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-2012-10019CRITICALFront-end Editor < 2.3 - Arbitrary File UploadEPSS 3.8%CVE-2026-38526CRITICALAn authenticated arbitrary file upload vulnerability in the /admin/tinymce/upload endpoint of Webkul Krayin CRM v2.2.x allows attackers to eEPSS 3.8%CVE-2024-31777CRITICALFile Upload vulnerability in openeclass v.3.15 and before allows an attacker to execute arbitrary code via a crafted file to the certbadge.pEPSS 3.8%CVE-2021-24376—Autoptimize < 2.7.8 - Arbitrary File Upload via "Import Settings"EPSS 3.7%CVE-2020-26285HIGHWidget instances allows a hacker to inject an executable file on the server on OpenMageEPSS 3.7%CVE-2023-3049CRITICALFile Upload in TMT's LockcellEPSS 3.7%CVE-2018-11091CRITICALAn issue was discovered in MyBiz MyProcureNet 5.0.0. A malicious file can be uploaded to the webserver by an attacker. It is possible for anEPSS 3.6%CVE-2023-2246MEDIUMSourceCodester Online Pizza Ordering System unrestricted uploadEPSS 3.6%CVE-2021-22697—A CWE-434: Unrestricted Upload of File with Dangerous Type vulnerability exists in the EcoStruxure Power Build - Rapsody software (V2.1.13 aEPSS 3.6%CVE-2015-10144HIGHResponsive Thumbnail Slider < 1.0.1 - Authenticated (Subscriber+) Arbitrary File UploadEPSS 3.6%CVE-2023-4739MEDIUMByzoro Smart S85F Management Platform updateos.php unrestricted uploadEPSS 3.6%CVE-2026-58480CRITICALBlocksy Companion Pro < 2.1.47 Unauthenticated File Upload via save_attachmentsEPSS 3.6%CVE-2025-54769HIGHKL-001-2025-016: Xorux LPAR2RRD File Upload Directory TraversalEPSS 3.6%CVE-2024-9290CRITICALSuper Backup & Clone - Migrate for WordPress <= 2.3.3 - Unauthenticated Arbitrary File UploadEPSS 3.5%CVE-2021-44159CRITICAL4MOSAn GCB Doctor - Unrestricted Upload of FileEPSS 3.5%CVE-2026-5524CRITICALDivi Form Builder <= 5.1.8 - Unauthenticated Arbitrary File Upload Leading to Remote Code Execution via 'acceptFileTypes' ParameterEPSS 3.5%CVE-2026-14894CRITICALSuper Forms <= 6.3.313 - Unauthenticated Arbitrary File Upload via 'data' Parameter (datauristring / value)EPSS 3.5%CVE-2026-1405CRITICALSlider Future <= 1.0.5 - Unauthenticated Arbitrary File UploadEPSS 3.5%CVE-2021-4462CRITICALEmployee Records System v1.0 Arbitrary File Upload RCEEPSS 3.4%CVE-2019-1888HIGHCisco Unified Contact Center Express Privilege Escalation VulnerabilityEPSS 3.4%