Top 6 MCP Servers for Security & Testing in 2026
Model Context Protocol (MCP) servers are how AI coding agents like Claude Code, Cursor, and VS Code reach out of the chat window and into real tools — a static analyzer, a browser, a port scanner, a threat-intelligence API. For security and testing work this is a genuine force multiplier: an agent can scan a diff for vulnerabilities, drive an end-to-end browser test, or triage a suspicious URL without you leaving the editor. But it cuts both ways. Every server you install is code that runs with your permissions, and a security tool that is itself insecure is worse than none.
That is the differentiator for this list. Every server below has been scanned by MCP Trust Checker, so you see its MCP Trust Score — a letter grade from A to F and a 0–100 number — right next to what it does, instead of guessing from GitHub stars. The score is deterministic: it reads the actual published package source and grades capabilities, permissions, and risky data-flow patterns. Read it simply: A (90–100) is clean, B (80–89) is solid with minor findings worth a glance, and anything lower or with high-severity findings deserves a real look at the registry page before you grant it access.
These are the six most useful, most widely adopted servers in the Security & Testing category, ordered best-first — popularity and usefulness lead, with grade as a tie-breaker.
1. Playwright MCP
Microsoft's official Playwright server is the dominant choice for the testing half of this category. It gives an agent full browser control through structured accessibility snapshots rather than screenshots or a vision model, which makes it fast, deterministic, and cheap to run. In practice that means you can describe a user flow in plain language and have the agent drive it end-to-end across Chromium, Firefox, and WebKit, generate reusable Playwright test scripts, or reproduce a reported bug step by step.
It also earns the cleanest grade on this list, with a minimal capability footprint and zero high-severity findings.
MCP Trust Score: A (100/100) · GitHub · npm
2. Semgrep MCP
Semgrep's official server exposes its static-analysis engine as callable tools, making it the go-to SAST integration for AI-driven code review. An agent can scan code for security vulnerabilities inline, run custom Semgrep rules, dump the AST, and pull findings straight from the Semgrep AppSec Platform — catching OWASP-style bugs while you are still writing the code. It is the most-recommended SAST option in nearly every security-MCP roundup, and rightly so.
Honesty first: our scan grades it B (88/100) and flags 3 high-severity findings, and it runs at a high capability level. That is common for a tool that needs deep access to your codebase, but it is worth reviewing the specifics on its registry page before you wire it into an automated pipeline.
MCP Trust Score: B (88/100) · GitHub · PyPI
3. VirusTotal MCP
This server wraps the VirusTotal API so an assistant can analyze URLs, files, IPs, and domains for malware and reputation, returning multi-engine detection reports plus relationship (pivot) data and pagination. It is a core building block for SOC and incident-response workflows — the kind of IOC triage where you want a fast, structured verdict rather than a browser tab full of engine results. It is one of the most-referenced security servers in the ecosystem, including Snyk's own roundup.
It scans clean: a minimal capability footprint and no high-severity findings.
MCP Trust Score: A (100/100) · GitHub · npm
4. Shodan MCP
Shodan MCP exposes the Shodan API and CVEDB to an agent for internet-wide reconnaissance: searching internet-connected devices, IP and host lookups, DNS operations, and CVE/CPE vulnerability intelligence. It is a staple for external attack-surface mapping — figuring out what of yours is exposed, and what known vulnerabilities that exposure implies — and it pairs naturally with the threat-intel work above.
Like its sibling from the same author, it grades cleanly with a minimal capability footprint and no high-severity findings.
MCP Trust Score: A (100/100) · GitHub · npm
5. Nmap MCP Server
This server wraps the Nmap CLI so an assistant can run network scans from natural language — quick scans, full port sweeps, service and version detection, and configurable timing templates. Port scanning and network discovery are the foundational first step of most pentest and audit workflows, and this is the most commonly cited standalone Nmap MCP with an actually published package.
A fair-warning note: because it shells out to the Nmap binary it runs at a high capability level, and our scan flags 2 high-severity findings. The grade is still a strong A (98/100), but review those findings on its registry page before you let an agent invoke it unattended.
MCP Trust Score: A (98/100) · GitHub · npm
6. Postman MCP Server
Postman's official server lets an agent operate on the Postman platform: create and run collections, manage environments, and execute API tests and contract checks so code stays in sync with specs. With 80+ tools it turns natural-language prompts into repeatable API-testing and validation workflows, and it is the de facto standard for AI-driven API testing.
Our scan grades it B (85/100) with 1 high-severity finding, though it keeps a minimal capability footprint. Worth a quick review on the registry page, but nothing alarming for an official, actively maintained server.
MCP Trust Score: B (85/100) · GitHub · npm
How we graded these
Every score in this post comes from the MCP Trust Checker engine, which is deterministic and open source. It downloads the published npm or PyPI package and analyzes the actual source — mapping the server's capabilities, permissions, and risky data-flow patterns against the MTC rule set — with no LLM anywhere in the pipeline. The same input always produces the same score, so the grade you see is reproducible and auditable rather than a subjective impression. You can browse the full methodology and every server's detailed findings across the registry, and see the wider security landscape on the security overview.
Want the rest of the field, or to check a package that is not on this list? Browse the full Security & Testing category, or scan any npm or PyPI MCP package for free through the MCP Trust Checker API — the grade takes seconds, and it is a lot cheaper than trusting a tool on stars alone.
Frequently asked questions
What is the best MCP server for security and testing in 2026?
It depends on the job. For browser-based end-to-end testing, Playwright MCP is the dominant choice and scores a clean A (100/100) on MCP Trust Checker. For static analysis (SAST) of your code, Semgrep MCP is the most-recommended option, though it grades a B (88/100) with a few high-severity findings worth reviewing. For threat intelligence and reconnaissance, VirusTotal MCP and Shodan MCP both score A (100/100).
Are MCP servers safe to install?
Not automatically. An MCP server is code that runs with your permissions, so a poorly built or malicious one can be a real risk — which is exactly why security tooling matters here. Before installing any server, check its MCP Trust Score on the MCP Trust Checker registry: an A grade with a minimal capability footprint is low-risk, while lower grades or high-severity findings deserve a careful look at the registry page first.
What is an MCP Trust Score?
It is a letter grade (A–F) and a 0–100 number produced by the open-source MCP Trust Checker engine. The engine reads the actual published npm or PyPI package source and deterministically grades its capabilities, permissions, and risky data-flow patterns — no LLM involved, so the same package always gets the same score. Read A (90–100) as clean, B (80–89) as solid with minor findings, and anything lower as needing review.
Which MCP server should I use for API testing?
Postman MCP Server is the de facto standard for AI-driven API testing, with 80+ tools for running collections, managing environments, and executing contract checks. It grades a B (85/100) with one high-severity finding on MCP Trust Checker — solid for an official, actively maintained server, but review the finding on its registry page before automating it.
Can an AI agent run security scans by itself with these servers?
Yes. Servers like Semgrep (SAST), Nmap (port scanning), Shodan (attack-surface recon), and VirusTotal (IOC triage) expose their engines as callable tools, so an agent can run scans from natural-language prompts. Note that tools which shell out to binaries — like Nmap and Semgrep — run at a higher capability level and carry high-severity findings in our scan, so review their registry pages before letting an agent invoke them unattended.
Scan your MCP server now
MCP Trust Checker is free, open-source and runs entirely on your machine. Get an A–F Trust Score for any MCP server in seconds.
npx mcptrustchecker