Insecure File Upload Detection

by utkusen

Insecure File Upload Detection is a Quality skill for Claude Code, published by utkusen in sast-skills.

1.3K stars61 forkson utkusen/sast-skillsAdded 2026/07/20Repository updated 2026/04/08

View source on GitHub Download repo ZIP

ai-securityclaudeclaude-codesast

Install in seconds

Install Insecure File Upload Detection

Copy Insecure File Upload Detection into your Claude Code skills folder. Run the command in your terminal, or review the source on GitHub before installing.

terminal

npx degit https://github.com/utkusen/sast-skills/tree/main/sast-files/.agents/skills/sast-fileupload ~/.claude/skills/sast-fileupload

Requires Node.js. Downloads this skill only — not the rest of the repository — into your Claude Code skills folder.

Without Node.js

git clone https://github.com/utkusen/sast-skills.git

Clones the whole repository, then copy the skill’s own directory into your skills folder yourself.

In this catalog

Source file: sast-files/.agents/skills/sast-fileupload/SKILL.md in utkusen/sast-skills
Installs to: ~/.claude/skills/sast-fileupload
Collection: One of 17 skills cataloged from this repository
Category: Quality — 1897 skills

What Insecure File Upload Detection does

Detect insecure file upload vulnerabilities in a codebase using a three-phase approach: discovery, batched verify, and merge. Use when asked to find file upload, unrestricted upload, or extension bypass bugs.

Insecure File Upload Detection is cataloged under Quality on DirSkills. Insecure File Upload Detection comes from a repository tagged ai-security, claude, claude-code and sast.

Documentation

README

Excerpt

Insecure File Upload Detection

You are performing a focused security assessment to find insecure file upload vulnerabilities in a codebase. This skill uses a three-phase approach with subagents: discovery (find all places where uploaded files are received and stored), batched verify (check bypass vectors in parallel batches of up to 3 upload sites each), and merge (consolidate batch reports into one results file).

Prerequisites: sast/architecture.md must exist. Run the analysis skill first if it doesn't.

What is an Insecure File Upload

This is the opening of the README. Read the full README on GitHub.

Commands Insecure File Upload Detection provides

Slash commands named in this skill’s SKILL.md, listed in the order they first appear.

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Frequently asked about Insecure File Upload Detection

What else does utkusen publish alongside Insecure File Upload Detection?
Insecure File Upload Detection is one of 17 skills that DirSkills catalogs from utkusen/sast-skills, the repository it ships in. Its siblings there include Business Logic Vulnerability Detection, Cross-Site Scripting Detection and GraphQL Injection Detection. Each one is a separate skill with its own page in this directory, installs the same way Insecure File Upload Detection does, and is maintained by utkusen in that same repository. The rest of the collection is listed on the utkusen/sast-skills page.
How does Insecure File Upload Detection compare to other Quality skills?
Insecure File Upload Detection ranks #715 by stars among the 1897 Quality skills in this catalog. The most-starred ones next to it are Benchmark, Benchmark Optimization Loop and API Design Patterns. DirSkills ranks by the star count of the repository each skill ships in, so that order reflects how popular those repositories are rather than any review of Insecure File Upload Detection against them. Open each page to compare what they document and how they install.