hunting-nosql-operator-and-where-injection SKILL.md skillA
hunting-nosql-operator-and-where-injection 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-nosql-operator-and-where-injection@git:20260826.c45369bPins git:20260826.c45369b 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-nosql-operator-and-where-injection/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260826.c45369b, committed Aug 26, 2026
- Size
- 9,179 bytes
- Repository stars
- 26
- License
- MIT
Hunt NoSQL injection where untrusted input becomes query structure rather than a bound value: a request body whose keys turn into query operators, a value that arrives as an object instead of a scalar, or input reaching a server-side JavaScript evaluation such as $where, a mapReduce function, or an aggregation expression. Covers document stores where a filter built from a request object lets the caller inject comparison operators, always-true conditions, or code, and key-value or wide-column…
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Hunting NoSQL operator and where injection: when a value arrives as an operator NoSQL injection rarely looks like classic SQL injection because there is no string to concatenate. Instead, a document store filter is often built directly from a request object, so if the attacker sends an object where the code expected a scalar, its keys become query operators. A login check that compares a password to a request field can be turned always-true by sending an operator that matches anything. Worse, some stores evaluate server-side JavaScript, in a `$where` clause, a mapReduce function, or an aggregation expression, and untrusted input reaching that path is code execution inside the database. You find these by separating filters that bind scalar values from those that accept a request-shaped object or an expression, and tracing untrusted input into the latter. ## When to use - Data access uses a document, key-value, or wide-column store with request-built query filters. - A request field expected to be a scalar could arrive as an object whose keys become operators. - Untrusted input can reach a server-side JavaScript evaluation: `$where`, mapReduce, or an aggregation. …
Read the whole file at its exact version.
How to install
mdr add unboundcompute/security-agent-skills/hunting-nosql-operator-and-where-injection@sha256:5622a517d80fb68dThe line at the top of this page pins the label git:20260826.c45369b, 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_qvs3ctd2yci42i6j)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Aug 26, 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 (9179 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_qvs3ctd2yci42i6j GET https://markdownregistry.com/api/v1/resolve?ref=unboundcompute/security-agent-skills/hunting-nosql-operator-and-where-injection GET https://markdownregistry.com/api/v1/blob/5622a517d80fb68d96e5aa9401d6146b0af6273c5e4172c9433d8fb0fca0ec3b
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.