Supply chain attack via 21 backdoored Magento extensions affected 500–1,000 e-stores, including a $40B multinational e-store.Researchers at Sansec uncovered a coordinated supply chain attack where a backdoor was hidden in 21 applications, lingering undiscovered for 6 years.The malicious code injection was recently discovered after threat actors compromised e-commerce servers through the backdoored extensions.Impacted vendors include Tigren, Magesolution (MGS), and Meetanshi, with varied responses received when contacted by Sansec.