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Simon Willison bypasses CSP with GPT-5.5 in Codex app

Simon Willison has developed an experimental method to bypass Content Security Policy (CSP) restrictions in web applications. This technique involves running an app within a sandboxed iframe and using a custom fetch function to intercept CSP errors. The parent window can then prompt the user to add the problematic domain to an allow-list, enabling the app to refresh and function correctly. Willison built this demonstration using GPT-5.5 xhigh within the Codex desktop application. AI

影响 Demonstrates a novel technique for overcoming web security limitations using existing AI models, potentially impacting how developers build and secure web applications.

排序理由 The cluster describes a technical experiment and a new method for bypassing security restrictions, built using existing AI models and applications, rather than a novel model release or significant industry event.

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Simon Willison bypasses CSP with GPT-5.5 in Codex app

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  1. Simon Willison TIER_1 English(EN) ·

    CSP Allow-list Experiment

    <p><strong>Tool:</strong> <a href="https://tools.simonwillison.net/csp-allow">CSP Allow-list Experiment</a></p> <p>An experiment that shows that you can load an app in a CSP-protected sandboxed iframe (see <a href="https://simonwillison.net/2026/Apr/3/test-csp-iframe-escape/">pre…