Cyberpress
Cache Deception Vulnerability in SvelteKit and Vercel Exposes User Data
First seen 20 Feb 2026, 10:16 UTC
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A cache deception vulnerability was discovered in applications built with SvelteKit and deployed on Vercel, allowing attackers to read responses from other signed-in users. The issue was reported by an AI agent during testing and was confirmed reproducible. Vercel issued a fix for the vulnerability on February 19, 2026.
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Timeline
2026-02-19
Vercel released a patch for the vulnerability
2026-02-19
Aikido.Dev published article detailing the vulnerability
2026-02-20
Cyberpress published article on the vulnerability