Polyfill.io — Cyber Attacks, Breaches & Threat Activity

Threat entity extracted from intelligence sources

Frequency
3
occurrences
First Seen
November 14, 2025
Last Seen
March 31, 2026

Polyfill.io is a cloud-based CDN that serves JavaScript polyfills to client browsers based on feature detection, enabling websites to support older or less capable browsers.

Overview

Polyfill.io is a cloud-based CDN that serves JavaScript polyfills to client browsers based on feature detection, enabling websites to support older or less capable browsers. It is a widely used third-party dependency, so its compromise or abuse could pose supply-chain or client-side attack risks across many sites. The entity is noted in Kaspersky GReAT's India cyberthreat matrix for 2026, indicating its relevance to threat modeling of web ecosystem risk.

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Recent Intelligence Reports

  • Hacker hijacks Axios open-source project, used by millions, to push malware — Techcrunch · March 31, 2026
  • Rising Software Supply Chain Attacks: AI Risks and Essential Defenses — Webpronews · December 29, 2025
  • India's cyberthreat matrix for 2026 : Kaspersky GReAT expert — Ciso.Economictimes.Indiatimes · November 14, 2025

CVSS v3.1 Breakdown