Individual skill

web-host-header

Host header injection — abuse a trusted Host/X-Forwarded-Host to poison password-reset links, routing, and caches. Load when the app builds absolute URLs from the request host, on password-reset flows, or behind a proxy/CDN. Signals: reset emails with links, X-Forwarded-Host reflected, virtual hosting, cache in front.

skills/web/web-host-header/SKILL.md

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Last checked: Nov 7, 2026

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Repository stars (not skill ratings): 27
Repository last updated: Oct 14, 2026
License: MIT

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SKILL.mdcore · 2,447 bytes

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# Host header injection

## When it applies
The server trusts the `Host` (or `X-Forwarded-Host`) header to build absolute URLs, decide
routing, or key a cache. Classic impact: password-reset poisoning (the reset link points at your
domain, so the victim's token comes to you).

## Why it works
[Credential-related source omitted]
attacker-controlled, so if it isn't validated against an allowlist, you control where generated
links point — and where secrets in them land.

## Method
1. **Reset poisoning**: trigger a password reset for a victim; intercept and set `Host: