Individual skill

xs-leaks

XS-Leaks — cross-site information leaks via timing, frame counting, navigation, error oracles. Side-channel attacks against same-origin authenticated state.

packages/decepticon/decepticon/skills/standard/exploit/web/xs-leaks/SKILL.md

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# XS-Leaks (Cross-Site Leaks)

XS-Leaks abuse browser primitives that leak information ACROSS origins.
Attacker page can observe whether a cross-origin GET returned different
content based on victim's authenticated state. Smaller than full
cross-origin read (which is blocked), but enough to enumerate identifiers,
detect membership, learn search-result presence.

## 1. Categories

### 1.1 Timing oracles
Cross-origin fetch / image load timing varies by server response size.
Attacker measures load time → infers content.
```javascript