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ClaudSkills / Security / web-security

Security Input Validation

Category: Security  ·  Sub-category: web-security  ·  Last updated:
Use when a ticket handles untrusted input — request bodies/params, query strings, headers, uploads, webhooks, or third-party API responses — and it must be validated and safely handled. Invoke for "validate the request", "sanitize user input", "fix the injection/XSS risk", or when adding any boundary that ingests external data.
Security AStatic scan found no risk patternsHow grading works ›

From the source SKILL.md

Everything that crosses a trust boundary is hostile until proven otherwise. That includes HTTP input, webhooks, message payloads, files, environment-sourced URLs and third-party API responses. The defence has two halves. Validate at the boundary, so malformed input is rejected. Encode or parameterise at every sink, so input that passes validation still cannot change the meaning of SQL, HTML, a shell command or a path. Validation alone never prevents injection (OWASP Input Validation Cheat Sheet; ASVS 5.0 V1 and V2).

What this skill does

Security Input Validation is a community-contributed Claude Code skill in the web-security sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/security-input-validation/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use when a ticket handles untrusted input — request bodies/params, query strings, headers, uploads, webhooks, or third-party API responses — and it must be validated and safely handled. Invoke for "validate the request", "sanitize user input", "fix the injection/XSS risk", or when adding any boundary that ingests external data.

Who uses this skill

The Security Input Validation Claude Code skill is built for security engineers, penetration testers, DevSecOps practitioners, and development teams hardening codebases and infrastructure. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 213,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/security-input-validation
curl -L https://claudskills.com/skills/security-input-validation/SKILL.md \
  -o ~/.claude/skills/security-input-validation/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/security-input-validation/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/security-input-validation/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\security-input-validation\SKILL.md on Windows. See the full install guide for step-by-step instructions.

Telegram

📱 Install from your phone or desktop Telegram

Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

Pro

For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.

See pricing → Download desktop app

Frequently asked questions

How do I install the Security Input Validation Claude Code skill?
Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/security-input-validation/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.
What does the Security Input Validation skill do?
Use when a ticket handles untrusted input — request bodies/params, query strings, headers, uploads, webhooks, or third-party API responses — and it must be validated and safely handled. Invoke for "validate the request", "sanitize user input", "fix the injection/XSS risk", or when adding any boundary that ingests external data.
Is this skill free to install?
Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.
When should I use the Security Input Validation skill?
Use Security Input Validation when your Claude Code task falls under the Security category — specifically in the web security area. Claude Code auto-discovers installed skills and invokes the right one based on the task description, so you can also ask Claude directly (e.g. "use Security Input Validation" or describe the task and let Claude pick). Browse related skills at /category/security/.
What is a Claude Code skill and how does the Security Input Validation skill fit in?
A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Security Input Validation is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Security category. Learn more at /learn/what-is-a-claude-skill/.

Attribution & license

Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA
tmj-90. (2026). Security Input Validation [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/security-input-validation/
BibTeX
@misc{security-input-validation-2026,
  author    = {tmj-90},
  title     = {Security Input Validation [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/security-input-validation/}
}

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Security scan

Grade A · scanned 2026-11-01 — free static scan against the OWASP Agentic Skills Top 10.

The scan flagged 2 of 10 categories (filesystem, network), including lower-severity patterns. Patterns shown inside code fences are weighted as examples rather than instructions — read the grading methodology for what this does and does not guarantee.

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[![Security: A](https://img.shields.io/badge/Security-A-2e7d32)](https://claudskills.com/skills/security-input-validation/#security)

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Browse all Security skills in the ClaudSkills registry, or explore these other picks from the same category:

Browse all Security skills → Top 100 skills
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