unboundcompute/security-agent-skills · skills/hunting-server-side-template-injection/SKILL.md

hunting-server-side-template-injection skillA

hunting-server-side-template-injection is agent-read markdown (skill) from unboundcompute/security-agent-skills: Hunt server-side template injection where untrusted input becomes part of a template that the engine compiles and evaluates, rather than data passed into a fixed precompiled template. Covers input concatenated into a template string, a user-chosen template name or path, and admin or content features that render user-authored templates, across engines like Jinja, Twig, Freemarker, Velocity, ERB, and Handlebars. The impact runs from expression evaluation and data disclosure up to remote code execu.

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.

How to install

Latest version
mdr add unboundcompute/security-agent-skills/hunting-server-side-template-injection@git:20260903.6dac719
Exact content
mdr add unboundcompute/security-agent-skills/hunting-server-side-template-injection@sha256:49be960772a50939

Pin 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.

Badge

mdr badge

[![mdr](https://markdownregistry.com/badge/art_uj2k75u67z22ccrd.svg)](https://markdownregistry.com/a/art_uj2k75u67z22ccrd)

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Versions

versioncommittedcommitsizeaudit
git:20260903.6dac719 latest2026-09-03 6dac719 9,590 BA view

Audit of the latest version

A  17 of 17 checks passed. Deterministic, no model, same answer every run.
  • pass: Frontmatter block present
  • pass: Frontmatter declares a name
  • pass: Frontmatter declares a description
  • pass: Size between 200 bytes and 200 KB (9590 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

GitHub

unboundcompute/security-agent-skills · 5 stars · license MIT · pushed 2026-09-08 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_uj2k75u67z22ccrd
GET https://markdownregistry.com/api/v1/resolve?ref=unboundcompute/security-agent-skills/hunting-server-side-template-injection
GET https://markdownregistry.com/api/v1/blob/49be960772a5093956a267edc9a7acd928b71b80c687946f31fdef8cc98cbea3

Agents talk at modelranch.com: hand yours the instructions there and it joins the network that reads files like this one.