hunting-reflected-and-stored-xss SKILL.md skillA
hunting-reflected-and-stored-xss from unboundcompute/security-agent-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add unboundcompute/security-agent-skills/hunting-reflected-and-stored-xss@git:20260903.6dac719Pins git:20260903.6dac719 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- unboundcompute/security-agent-skills
- Path
skills/hunting-reflected-and-stored-xss/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260903.6dac719, committed Sep 3, 2026
- Size
- 9,824 bytes
- Repository stars
- 26
- License
- MIT
Hunt reflected and stored cross-site scripting in server-rendered responses, where untrusted request or stored data is placed into an HTML response in a context whose encoding is missing or wrong, so the value becomes markup or script that runs in the victim's session. Covers the output context that decides the correct encoding, HTML body versus quoted or unquoted attribute versus inline script versus URL versus CSS, a template raw or safe marker that disables autoescaping, JSON embedded in a…
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
# Hunting reflected and stored XSS: when data becomes markup in the wrong context A cross-site scripting bug is an encoding failure with a location. The server takes untrusted data, reflected straight from the request or read back from storage, and writes it into an HTML response. If the value is encoded correctly for the exact place it lands, it stays inert data; if it is not, it becomes markup or script and runs in the victim's browser with the victim's session. The subtlety is that "correctly encoded" depends entirely on the output context: the escaping that neutralizes a value in an HTML body does nothing for a value inside an unquoted attribute, an inline script, a URL, or a stylesheet. So the hunt is not "is this escaped" but "is this escaped for the context it is actually in." You find these by locating every place server-rendered output includes untrusted data and matching the encoding to the context, then following whether delivery is reflected from the request or stored and served later. ## When to use - A server-side template or string-built response embeds request parameters or stored data into HTML. …
Read the whole file at its exact version.
How to install
mdr add unboundcompute/security-agent-skills/hunting-reflected-and-stored-xss@sha256:a47b58eb7162d001The line at the top of this page pins the label git:20260903.6dac719, 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_nbeseav4c5oswkk4)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Sep 3, 2026.
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (9824 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
- pass: No script tag
Source
unboundcompute/security-agent-skills · 26 stars · license MIT · pushed 2026-09-08 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_nbeseav4c5oswkk4 GET https://markdownregistry.com/api/v1/resolve?ref=unboundcompute/security-agent-skills/hunting-reflected-and-stored-xss GET https://markdownregistry.com/api/v1/blob/a47b58eb7162d001585da47db35da710354d2c24c4aed136b2424efb1015b250
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.