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-2024-34982CRITICALAn arbitrary file upload vulnerability in the component /include/file.php of lylme_spage v1.9.5 allows attackers to execute arbitrary code vEPSS 4.7%CVE-2024-33752MEDIUMAn arbitrary file upload vulnerability exists in emlog pro 2.3.0 and pro 2.3.2 at admin/views/plugin.php that could be exploited by a remoteEPSS 4.6%CVE-2025-47577CRITICALWordPress TI WooCommerce Wishlist plugin <= 2.9.2 - Arbitrary File Upload VulnerabilityEPSS 4.6%CVE-2024-27115CRITICALRemote Code Execution through File Upload in SOPlanning before 1.52.02EPSS 4.6%CVE-2024-43160CRITICALWordPress BerqWP plugin <= 1.7.6 - Unauthenticated Arbitrary File Upload vulnerabilityEPSS 4.6%CVE-2026-15748CRITICALForminator Forms <= 1.56.1 - Unauthenticated Arbitrary File Upload via Forged Upload Field ConfigurationEPSS 4.6%CVE-2021-39139HIGHXStream is vulnerable to an Arbitrary Code Execution attackEPSS 4.5%CVE-2026-1306CRITICALmidi-Synth <= 1.1.0 - Unauthenticated Arbitrary File Upload via 'export' AJAX ActionEPSS 4.5%CVE-2021-39153HIGHXStream is vulnerable to an Arbitrary Code Execution attackEPSS 4.5%CVE-2023-1826MEDIUMSourceCodester Online Computer and Laptop Store index.php unrestricted uploadEPSS 4.4%CVE-2021-34997HIGHThis vulnerability allows remote attackers to execute arbitrary code on affected installations of Commvault CommCell 11.22.22. Although authEPSS 4.2%CVE-2021-21014CRITICALMagento Commerce Arbitrary Folder Empty Could Lead To Arbitrary Code ExecutionEPSS 4.2%CVE-2026-5718HIGHDrag and Drop Multiple File Upload for Contact Form 7 <= 1.3.9.7 - Unauthenticated Arbitrary File Upload via Non-ASCII Filename Blacklist BypassEPSS 4.2%CVE-2023-52324HIGHAn unrestricted file upload vulnerability in Trend Micro Apex Central could allow a remote attacker to create arbitrary files on affected inEPSS 4.2%CVE-2018-25114CRITICALosCommerce 2.3.4.1 Installer Unauthenticated Configuration File Injection PHP Code ExecutionEPSS 4.2%CVE-2012-10020CRITICALFoxyPress <= 0.4.2.1 - Arbitrary File UploadEPSS 4.1%CVE-2023-48777CRITICALWordPress Elementor plugin 3.3.0-3.18.1 - Arbitrary File Upload vulnerabilityEPSS 4.1%CVE-2019-3940—Advantech WebAccess 8.3.4 is vulnerable to file upload attacks via unauthenticated RPC call. An unauthenticated, remote attacker can use thiEPSS 4.1%CVE-2024-8425CRITICALWooCommerce Ultimate Gift Card <= 2.9.2 - Unauthenticated Arbitrary File UploadEPSS 4.1%CVE-2021-39145HIGHXStream is vulnerable to an Arbitrary Code Execution attackEPSS 4.1%