# Sensitive URL in Referrer Header

> Detects pages that expose sensitive parameters (tokens, IDs) in URLs that get leaked via the Referer header to external resources.

- Skill: `zakirkun/sensitive-url-in-referrer-header` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add zakirkun/sensitive-url-in-referrer-header`
- Raw SKILL.md: https://api.skillmd.com/api/skills/zakirkun/sensitive-url-in-referrer-header/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: zakirkun (https://skillmd.com/u/zakirkun)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/zakirkun/sensitive-url-in-referrer-header

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# Sensitive URL Referrer Leakage

## Overview
When a page loads external resources (images, scripts, analytics) and the page URL contains sensitive parameters (tokens, session IDs), the `Referer` header sent to external servers exposes these parameters. Password reset tokens and session tokens in URLs are particularly dangerous.

## Remediation
- Never put sensitive tokens in URL query parameters
- Use `Referrer-Policy: no-referrer` or `strict-origin` meta tag/header
- Use POST requests for sensitive data submission