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Online ad firm Adform’s script compromised to steal cryptocurrency

July 31, 2026 · BleepingComputer · Severity: MEDIUM

BleepingComputer reports that online advertising firm Adform's script was compromised to steal cryptocurrency from visitors. The attack injected wallet-swapping code affecting numerous publisher sites. Ad networks are urged to audit third-party scripts and enforce CSP headers.

Key Takeaways

  • Online ad firm Adform had its advertising script compromised to steal cryptocurrency from website visitors.
  • The attack modified Adform's script to inject wallet-swapping code affecting thousands of publisher sites.
  • Ad networks and publishers should audit third-party scripts and implement content security policies.
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