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exploiting-file-upload-vulnerabilities

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Identifying and exploiting insecure file upload functionality to achieve remote code execution, stored XSS, path traversal, and denial of service during authorized penetration tests.

internal/tools/skills/data/web-application-security/exploiting-file-upload-vulnerabilities/SKILL.md

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Apache-2.0

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# Exploiting File Upload Vulnerabilities

## When to Use

- During authorized penetration tests when the application allows users to upload files (avatars, documents, images, attachments)
- When testing file processing features (image resizing, document conversion, CSV/XML import)
- For assessing applications with rich media upload (profile pictures, galleries, file managers)
- When evaluating APIs with multipart form data endpoints
- During security assessments of cloud storage integrations (S3 pre-signed URLs, Azure Blob)

## Critical: Payload Matrix and Bypasses (checklist-derived)

### Extension bypass matrix (PHP/ASP/JSP targets)
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