cspt-xss SKILL.md skillB
cspt-xss from dreadnode/capabilities is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add dreadnode/capabilities/cspt-xss@git:20260923.1ccb5b1Pins git:20260923.1ccb5b1 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- B, 16 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- dreadnode/capabilities
- Path
capabilities/web-security/skills/cspt-xss/SKILL.md- Versions recorded
- 2
- Latest version
- git:20260923.1ccb5b1, committed Sep 23, 2026
- First version recorded
- May 4, 2026
- Size
- 37,281 bytes
- Repository stars
- 22
- License
- MIT
Client-Side Path Traversal — exploit CSR/SSR apps where URL parameters control fetch/XHR paths to inject cross-origin responses, achieve XSS, CSRF, or SSRF. Covers all 8 major frameworks with source-code-level decoding pipeline analysis, query param universality, secondary context (server-side) traversal, and per-framework XSS sinks. Use when any SPA/hybrid app fetches API data using URL-derived path segments.
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
# Client-Side Path Traversal (CSPT) ## Pattern SPA and hybrid applications (React, Vue, Angular, Next.js, Nuxt, SvelteKit, Ember, SolidStart) that construct API fetch paths from URL parameters, hash fragments, or path segments. The fetch destination is attacker-controllable, enabling injection of arbitrary API responses into the rendering context (XSS), triggering state-changing operations (CSRF), or reaching internal services through server-side fetch (SSRF). **Preconditions:** - App fetches data using a URL-derived value (path param, query param, hash fragment) - The fetch path is not validated or allowlisted on the client/server - The injected response is rendered in a security-sensitive context (innerHTML or framework equivalent) OR hits a state-changing endpoint (CSRF) OR server-side fetch reaches internal services (SSRF) ## Injection Sources Three sources feed attacker input into fetch paths. Their decode behavior differs: | Source | Decode behavior | Segment boundary? | Encoding tricks needed? | |---|---|---|---| | Path params (`/settings/:userId`) | Framework-dependent (see matrix) | YES -- router splits on `/` first | Often yes (`%2F`, `%252F`) | …
Read the whole file at its exact version.
How to install
mdr add dreadnode/capabilities/cspt-xss@sha256:13603c9c0f15bc2fThe line at the top of this page pins the label git:20260923.1ccb5b1, 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_znbohwlk6aaaswu5)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 2 versions of this file, between May 4, 2026 and Sep 23, 2026, about one every 142 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260923.1ccb5b1 latest | 2026-09-23 | 1ccb5b1 | 37,281 B | B | view · diff |
| git:20260504.2a64374 | 2026-05-04 | 2a64374 | 37,433 B | B | view |
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 (37281 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
dreadnode/capabilities · 22 stars · license MIT · pushed 2026-11-02 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_znbohwlk6aaaswu5 GET https://markdownregistry.com/api/v1/resolve?ref=dreadnode/capabilities/cspt-xss GET https://markdownregistry.com/api/v1/blob/13603c9c0f15bc2f169c5cff186cc346ac1b5b871e35a80afefde3c0943706c5
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.