offensive-file-upload SKILL.md skillB
offensive-file-upload from miosa-osa/osa is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add miosa-osa/osa/offensive-file-upload@git:20260913.e13b6b8Pins git:20260913.e13b6b8 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- B, 16 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- miosa-osa/osa
- Path
priv/skills/offensive-file-upload/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260913.e13b6b8, committed Sep 13, 2026
- Size
- 31,779 bytes
- Repository stars
- 78
- License
- Apache-2.0
File upload vulnerability checklist: MIME type bypass, extension bypass, magic byte manipulation, path traversal in filenames, stored XSS via SVG/HTML upload, server-side processing attacks, and race conditions. Use for assessing file upload endpoints in web app pentests or bug bounty.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# SKILL: File Upload Vulnerabilities
## Metadata
- **Skill Name**: file-upload
- **Folder**: offensive-file-upload
- **Source**: https://github.com/SnailSploit/offensive-checklist/blob/main/file-upload.md
## Description
File upload vulnerability checklist: MIME type bypass, extension bypass, magic byte manipulation, path traversal in filenames, stored XSS via SVG/HTML upload, server-side processing attacks, and race conditions. Use for assessing file upload endpoints in web app pentests or bug bounty.
## Trigger Phrases
Use this skill when the conversation involves any of:
`file upload, MIME bypass, extension bypass, magic byte, path traversal upload, SVG XSS, polyglot, upload bypass, malicious upload, web shell upload`
## Full Methodology
# File Upload Vulnerabilities
## Mechanisms
```mermaid
flowchart TD
A[File Upload Vulnerabilities] --> B[Insufficient File Type Validation]
A --> C[Improper Extension Handling]
A --> D[Inadequate File Content Analysis]
A --> E[Unsafe File Storage]
A --> F[File Operation Mishandling]
A --> G[Directory Traversal]
A --> H[Race Conditions]
B --> I[Remote Code Execution]
C --> I
…Read the whole file at its exact version.
How to install
mdr add miosa-osa/osa/offensive-file-upload@sha256:2a3858496e46f2b7The line at the top of this page pins the label git:20260913.e13b6b8, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_7qnfxqtgq7auje66)
7 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Sep 13, 2026.
Audit of the latest version
- fail: No script tag (matched: <script)
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (31779 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
Starting a new one? Use a template for SKILL.md on mdpantry, which passes every one of these checks and says what to change in it.
Source
miosa-osa/osa · 78 stars · license Apache-2.0 · pushed 2026-10-29 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_7qnfxqtgq7auje66 GET https://markdownregistry.com/api/v1/resolve?ref=miosa-osa/osa/offensive-file-upload GET https://markdownregistry.com/api/v1/blob/2a3858496e46f2b7ef3227f9b55117efc78af1d639dcada4b934dbf30d8a9f9a
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.