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upload-insecure-files

Insecure file upload playbook. Use when testing upload validation, storage paths, processing pipelines, preview behavior, overwrite risks, and upload-to-RCE chains.

skills/upload-insecure-files/SKILL.md

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# SKILL: Upload Insecure Files — Validation Bypass, Storage Abuse, and Processing Chains

> **AI LOAD INSTRUCTION**: Expert file upload attack playbook. Use when the target accepts files, imports, avatars, media, documents, or archives and you need the full workflow: validation bypass, storage path abuse, post-upload access, parser exploitation, multi-tenant overwrite, and chaining into XSS, XXE, CMDi, traversal, or business logic impact. For web server parsing vulnerabilities, PUT method exploitation, and specific CVEs (WebLogic, Flink, Tomcat), load the companion [SCENARIOS.md](./SCENARIOS.md).

## 0. RELATED ROUTING

### Extended Scenarios

Also load [SCENARIOS.md](./SCENARIOS.md) when you need:
- IIS parsing vulnerabilities — `x.asp/` directory parsing, `;` semicolon truncation (`shell.asp;.jpg`)
- Nginx parsing misconfiguration — `avatar.jpg/.php` with `cgi.fix_pathinfo=1`
- Apache parsing — multiple extensions, `AddHandler`, CVE-2017-15715 `\n` (0x0A) bypass
- PUT method exploitation — IIS WebDAV PUT+COPY, Tomcat CVE-2017-12615 `readonly` + `.jsp/` bypass
- WebLogic CVE-2018-2894 arbitrary file upload via Web Service Test Page