sast-fileupload

sast-fileupload is a skill for Claude Code, Codex from capture0x/YeepForge. It costs 92 tokens per session (7,267 once invoked), scanned A, original, no licence file.

A source-code review for insecure file-upload handling. It finds upload locations and checks whether file extensions or related safeguards can be bypassed.

In plain words
What is it for?
Use it to inspect document, image, archive, and other file-upload features for weak validation.
Why use it?
It helps uncover upload paths that could allow dangerous files, unwanted content, or other unintended processing. The architecture map must be created first.

Skill for Claude CodeCodex

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/capture0x/yeepforge/sast-fileupload
Any agent
npx skills add capture0x/YeepForge --skill sast-fileupload
Clone the repo
git clone --depth 1 https://github.com/capture0x/YeepForge

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for sast-fileupload

README.md
[![agentmods](https://agentmods.dev/badge/skills/capture0x/yeepforge/sast-fileupload.svg)](https://agentmods.dev/skills/capture0x/yeepforge/sast-fileupload)
Your own site
<a href="https://agentmods.dev/skills/capture0x/yeepforge/sast-fileupload"><img src="https://agentmods.dev/badge/skills/capture0x/yeepforge/sast-fileupload.svg" alt="Measured on agentmods" height="20"></a>
Per session 92 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 7,267 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. Scan, not verified.
Origin unknown No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00092 $0.07267
Opus 5 $0.00046 $0.03633
Sonnet 5 $0.00018 $0.01453
Haiku 4.5 $0.00009 $0.00727

Measured 4d ago against content hash aa229b5ef46a, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

sast-fileupload scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 4d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

# VULNERABLE: content-type only check (trivially bypassed with curl -H)
modules/sast_skills/sast-fileupload/SKILL.md · 612 lines

The source is not reproduced here

A licence we could not identify

The repository carries a LICENSE file, but it is custom or dual enough that GitHub cannot name it and neither can this catalogue. Unknown terms are not permission, so the body is not copied here. Read the licence at the source and decide for yourself.

Read it on GitHub

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 4d ago First seen · 612 lines · 92 tokens per session scan A aa229b5ef46a

Subscribe to this mod's changes

sast-fileupload is a skill published in the GitHub repository capture0x/YeepForge (1 stars, last pushed 11d ago), with no licence file. It adds 92 tokens to every session and 7,267 once invoked, about $0.0005 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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