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CriticalSupply chainNov 1, 2026

Third-Party Website Script Hijacked to Steal Millions from Online Users

Hackers altered a trusted third-party page-speed script loaded on the Polymarket website, allowing malicious code to access signed-in accounts and divert approximately $2.7 million in funds. This incident highlights how an external vendor's compromised code can directly expose your business website and its visitors to serious harm. Canadian business owners must ensure that every external software tool integrated into their web platforms is properly vetted and secured.

Supply chain security briefing

Who is affected

Any organisation operating websites or online portals that load third-party scripts, analytics tools, or vendor software.

How to mitigate it

  1. 1Audit all external JavaScript libraries, tags, and third-party tools running on your company website.
  2. 2Implement Subresource Integrity (SRI) and Content Security Policies (CSP) to prevent unauthorized code from executing.
  3. 3Remove outdated, unmaintained, or unnecessary third-party plugins and tracking scripts immediately.
  4. 4Require multi-factor authentication and re-authentication prompts for sensitive account actions or monetary transfers.

How Outsource IT solves this

Managed Cybersecurity and Threat Protection provides comprehensive defence and monitoring to safeguard your digital footprint against external software threats and unauthorised intrusions.

Managed Cybersecurity & Threat Protection

Tags

Supply ChainWebsite SecurityThird-Party Risk

Source advisory: the-hacker-news

Not sure whether this affects your business?

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