Black Hills InfoSec - Bypassing CSP with JSONP: Introducing JSONPeek and CSP B Gone

A Content Security Policy (CSP) is a security mechanism implemented by web servers and enforced by browsers to prevent various types of attacks, primarily cross-site scripting (XSS). CSP works by restricting resources (scripts, stylesheets, images, etc.) on a webpage to only execute if they come from approved sources. However, like most things in security, CSP isn't bulletproof.

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from Black Hills Information Security, Inc. https://www.blackhillsinfosec.com/jsonpeek-and-csp-b-gone/

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