Brevo Supply Chain Attack: 100,000 Websites Infected with Malicious Script

Hackers compromised a Brevo API key to deploy a malicious Cloudflare worker.

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The fact

The script was injected into 100,000 websites through this supply chain attack.

The incident highlights cloud infrastructure vulnerabilities to API key exfiltration.

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Auto-synthesis from 1 media source · identified on September 18, 2026