offensive-xss skillC
offensive-xss is agent-read markdown (skill) from miosa-osa/osa: Cross-Site Scripting testing checklist: stored/reflected/DOM/blind XSS discovery, polyglot payloads, CSP bypass, XSS filter bypass, event handler injection, DOM clobbering, mutation XSS, and impact escalation (session hijack, phishing, keylogging). Use for web app XSS testing and bug bounty..
Indexed from public GitHub and served as immutable, content-addressed versions. Install it pinned to an exact SHA-256 with the mdr CLI, and every file is verified against the hash recorded here before it reaches your agent. The deterministic audit below grades the latest version, and the same file always earns the same grade.
What the file says
# SKILL: Cross-Site Scripting (XSS) ## Metadata - **Skill Name**: xss - **Folder**: offensive-xss - **Source**: https://github.com/SnailSploit/offensive-checklist/blob/main/xss.md ## Description Cross-Site Scripting testing checklist: stored/reflected/DOM/blind XSS discovery, polyglot payloads, CSP bypass, XSS filter bypass, event handler injection, DOM clobbering, mutation XSS, and impact escalation (session hijack, phishing, keylogging). Use for web app XSS testing and bug bounty. ## Trigger Phrases Use this skill when the conversation involves any of: `XSS, cross-site scripting, stored XSS, reflected XSS, DOM XSS, blind XSS, CSP bypass, XSS filter bypass, polyglot, DOM clobbering, mutation XSS, event handler injection` ## Full Methodology # Cross-Site Scripting (XSS) ## Shortcut - Look for user input opportunities on the application. When user input is stored and used to construct a web page later, test the input field for stored XSS. if user input in a URL gets reflected back on the resulting web page, test for reflected and DOM XSS. …
Read the whole file at its exact version.
How to install
mdr add miosa-osa/osa/offensive-xss@git:20260913.e13b6b8mdr add miosa-osa/osa/offensive-xss@sha256:ce91b91906ff8715Pin to a label to follow the author's releases, or to a sha256 to freeze the exact bytes forever. Either way the resolved hash is written to mdr.lock, and mdr install reproduces it on any machine.
[](https://markdownregistry.com/a/art_eois5byjnjsxjqv5)
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Versions
Audit of the latest version
- fail: No prompt-injection phrasing (matched: Ignore previous instructions)
- 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 (25950 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 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
Source
miosa-osa/osa · 74 stars · license NOASSERTION · pushed 2026-09-24 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_eois5byjnjsxjqv5 GET https://markdownregistry.com/api/v1/resolve?ref=miosa-osa/osa/offensive-xss GET https://markdownregistry.com/api/v1/blob/ce91b91906ff8715d45d692dc12cf4f489b9db6d04449987ba2293c91904db9a
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