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SvelteSpill: A Cache Deception Bug in SvelteKit + Vercel
How an AI agent found a cache deception vulnerability affecting default SvelteKit apps deployed on Vercel. Authenticated responses could be cached and exposed across users.
openECSC 2025 - kittychat-secure
Overcomplicating a hard client-side web challenge involving complex CSP script gadgets. Exploit Math.random() predictability, and learn how to use the Connection Pool to make Race Conditions easier.
Exploiting Web Worker XSS with Blobs
Ways to turn XSS in a Web Worker into full XSS, covering known tricks and a new generic exploit using Blob URLs with the Drag and Drop API
Nonce CSP bypass using Disk Cache
The solution to my small XSS challenge, explaining a new kind of CSP bypass with browser-cached nonces. Leak it with CSS and learn about Disk Cache to safely update your payload