**Action Required:** Please ensure you are pulling Polyfill from the Cloudflare mirror `cdnjs.cloudflare.com/polyfill/` (Cloudflare’s mirror). **Reference:** - [Automatically Replacing Polyfill.io Links with Cloudflare’s Mirror for a Safer Internet](https://blog.cloudflare.com/automatically-replacing-polyfill-io-links-with-cloudflares-mirror-for-a-safer-internet) - [Polyfill Supply Chain Attack](https://sansec.io/research/polyfill-supply-chain-attack) **Contacts:** - dldigitalsecurity@telus.com - [#security_help](https://telus.enterprise.slack.com/archives/C02NC99M9) **:rotating_light: Affected File:** `guide/getting-started/developers.md` File URL: https://github.com/telus/tds-core/blob/38ba5deb928632f74ecd2c223c123f4575a614ee/guide/getting-started/developers.md