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type-juggling

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PHP type juggling and weak comparison (`==`) bypass. Use when authentication, HMAC/signature checks, or token validation uses loose equality, numeric coercion, or hash comparisons without strict types — common in legacy PHP and CTF-style code paths.

skills/type-juggling/SKILL.md

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Nov 9, 2026

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Sep 13, 2026
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# SKILL: PHP Type Juggling — Weak Comparison & Magic Hash Bypass

> **AI LOAD INSTRUCTION**: PHP `==` coercion, magic hashes (`0e…`), HMAC/hash loose checks, NULL from bad types, and CTF-style `strcmp` / `json_decode` / `intval` tricks. Use strict routing: map the sink (`==` vs `hash_equals`), PHP major version, and whether both operands are attacker-controlled. Routing note: when you encounter PHP login/signature logic or code like `md5($_GET['x'])==md5($_GET['y'])`, start with this skill; if `hash_equals`/`===` is already used, this path usually does not apply.

## 0. QUICK START

**First-pass goal**: prove the server branch treats unequal secrets/tokens as equal via coercion, not guess the real password.

### First-pass payloads (auth / token shape)

```text
password[]=x
[Credential-related source omitted]
0