An unpatched zero-day vulnerability dubbed StyleSmuggler affects all current versions of Magento and Adobe Commerce, including 2.4.9, enabling unauthenticated remote code execution. Active exploitation began on September 4th, 2026. The attack operates in two stages: injecting malicious PHP code into Magento's template system using styles properties to evade safeguards, then executing the poisoned code via failed payment emails. Upon successful compromise, attackers deploy a Rust-based backdoor disguised as legitimate system processes (kworker, fc-cache, or chronyd) that connects to command and control servers. The backdoor uses NTP-shaped UDP traffic for C2 communication to evade detection. A second unrelated attacker has also been observed exploiting the same vulnerability to deploy PHP web shells. Affected merchants should deploy immediate mitigation measures, scan for compromise, and temporarily disable GraphQL until an official patch is released.
Created: 2026-09-08
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