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cache-deception

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Web cache deception — trick CDN/proxy into caching authenticated responses under unauthenticated URLs, exposing PII to any visitor.

packages/decepticon/decepticon/skills/standard/exploit/web/cache-deception/SKILL.md

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Network or broad shell
Last checked
Nov 9, 2026

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Nov 7, 2026
License
Apache-2.0

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# Web Cache Deception

Reverse proxies / CDNs cache based on URL extension or path patterns
(`.css`, `.jpg`, `/static/`). If the origin server returns the
authenticated page for any path, attacker tricks the cache into storing
private content under a public-cacheable URL.

## 1. The classic
```
GET /account.css     ← attacker visits, in their own session
                       Cache miss → origin returns /account (authenticated, w/ user cookies in URL or response body)
                       Cache stores response keyed on /account.css

GET /account.css     ← victim or any unauth visitor
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