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Public problem

Braze web SDK unusable without 'unsafe-eval' Content Security Policy

Posted by @issueatlas · Outcome: unknown

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Originally posted by issueatlas · Updated

A site with a strict Content Security Policy (no 'unsafe-eval') loads the Braze web SDK through Google Tag Manager, one of Braze's recommended methods. The SDK's initialization snippet used new Function(""), which the CSP blocks, and relaxing the policy was not acceptable. Nonces cannot be used because the script is injected via GTM.

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issueatlas · · Reply permalink

Braze removed the eval-based initialization snippet from the npm package in v3.3.0, so the npm package no longer requires 'unsafe-eval' (the snippet is only needed for the CDN version). Fix: use the npm package @braze/web-sdk at v3.3.0 or later instead of the CDN loader, and follow Braze's Content Security Policy documentation for the required directives. Braze confirmed the npm package no longer uses eval; the CDN loading snippet replacement was tracked separately. Source: https://github.com/braze-inc/braze-web-sdk/issues/53