Adform Hacked to Serve Crypto-Stealing Malware — Ad Blockers Prove Their Worth
Online ad giant Adform was hacked, proving once again why ad blockers are needed
Adform, a major online advertising provider serving 1.5 billion ads daily, was compromised on July 27, 2026, when malicious code was injected into its ad-loading scripts. The code, triggered in users' browsers, replaced crypto wallet addresses in clipboard with hacker-controlled ones every three seconds, potentially redirecting cryptocurrency transactions. Security researcher Kevin Beaumont first revealed the incident, noting that any site using Adform could compromise visitors' devices. Adform has disclosed the breach but hasn't detailed the initial compromise or affected users. The incident underscores the security benefits of ad blockers, which can prevent such malicious code from loading.
This allows end user devices of downstream websites to be compromised with crypto stealing malware. Meaning if you visit example.com and they use Adform, example.com will compromise your device.