Individual skill
s3-minio-content-type-xss
Exploit public bucket Content-Type override for stored XSS on target origin.
recon/s3-minio-content-type-xss/SKILL.md
Source commit 1260244136edc6ae698d76d3d526f503e322778d
What was checked
- Matches the observed repository HEAD
- Yes
- Scanner rules are current
- Yes
- Repository scan complete
- No
- Skill scan complete
- No
- Observed behavior
- Network or broad shell
- Last checked
- Nov 9, 2026
These are observations at the recorded commit, not a guarantee of safety. Review the source before running it.
Install this skill
Choose an agent in your Stack or copy a command below. Commands fetch the pinned commit and copy only this skill directory. Existing destinations are refused. Copying a command does not install anything.
An install command is unavailable: current rules, complete repository and skill scans, an eligible behavior level and a permitted license are required.
Repository context
- Repository stars (not skill ratings)
- 1,338
- Repository last updated
- Nov 7, 2026
- License
- MIT
Observed agent integration: No specific integration evidence. Standard SKILL.md installation does not imply verified compatibility.
- bug-bounty Repository topic
- cloud-security Repository topic
- firebase-hacking Repository topic
- hermes-agent Repository topic
- jwt-attacks Repository topic
- offensive-security Repository topic
- penetration-testing Repository topic
- reconnaissance Repository topic
- red-team Repository topic
- security-automation Repository topic
- recon Declared skill tag
- s3 Declared skill tag
- minio Declared skill tag
- bucket Declared skill tag
- xss Declared skill tag
- content-type Declared skill tag
- cloud Declared skill tag
- storage Declared skill tag
- writing Derived category
- security Derived category
- security-application Derived category
Files and excerpt
File metadata and permitted, redacted excerpts come from the recorded scan. Source links are pinned to that commit.
Browse files
Read excerpt
# S3/MinIO Content-Type Override to Stored XSS
Exploit public cloud storage buckets (S3, MinIO, and compatible) by overriding the `Content-Type` response header via query parameters. When a target serves user-uploaded files from its own origin (e.g., `cdn.target.com` or `target.com/uploads/`), a successful override turns a stored HTML/JS payload into same-origin stored XSS — bypassing every upload-time validation the application performed.
## When to Use
- Target serves user-uploaded files (images, avatars, attachments) from a public bucket.
- Files are served under the target's own domain or subdomain (not a random storage domain).
- Upload validation appears solid (extension whitelist, magic byte check, forced Content-Type) — the override bypasses all of these at serve time, not upload time.
- The bucket URL responds to `?response-content-type=` with a changed Content-Type.
- The bucket returns an AWS SignatureDoesNotMatch error leaking the real bucket host and region.
## Prerequisites
