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SecurityWeek Malware & Threats Cyberwarfare Cybercrime Data Breaches Fraud & Identity Theft Nation-State Ransomware Vulnerabilities Security Operations Threat Intelligence Incident Response Tracking & Law Enforcement Security Architecture Application Security Cloud Security Endpoint Security Identity & Access IoT Security Mobile & Wireless Network Security Risk Management Cyber Insurance Data Protection Privacy & Compliance Supply Chain Security CISO Strategy Cyber Insurance CISO Conversations CISO Forum ICS/OT Industrial Cybersecurity ICS Cybersecurity Conference Funding/M&A Cybersecurity Funding M&A Tracker Cyber AI Vulnerabilities Adobe Commerce Zero-Day Exploited to Backdoor Online Stores The StyleSmuggler zero-day allows attackers to execute code and deploy a stealthy backdoor on Adobe Commerce and Magento stores. By Ionut Arghire | September 7, 2026 (7:58 AM ET) Flipboard Reddit Whatsapp Whatsapp Email Threat actors are exploiting a zero-day vulnerability in Adobe Commerce and Magento e-commerce platforms to backdoor online stores, cybersecurity firm Sansec reports. Dubbed StyleSmuggler, the security defect enables attackers to inject PHP code into Magento’s template system and evade detection by using the ‘styles’ properties. According to Sansec, the attack works in two stages: first, the PHP code is injected by generating a failure report, and then Magento executes the code via a failed payment email. The remote code execution (RCE) flaw works on Magento versions 2.4.7, 2.4.8 and 2.4.9, and has been exploited against deployments running the July and August 2026 patches, Sansec says. Successful attacks have been deploying a backdoor against Commerce and Magento stores. Written in Rust, the backdoor was seen connecting to a command-and-control (C&C) server and waiting for commands. Sansec says the exploitation started on September 4, with the backdoor disguised as ‘[kworker/u:8:0]’. On September 6, a second version of the backdoor emerged, disguising itself as ‘fc-cache’.Advertisement. Scroll to continue reading. The malware hides its C&C communication as NTP server replies. Its messages carry host information, including agent ID, hostname and username, memory and disk usage, OS version, uptime, root access, and implant version. It also identifies the store’s public IP before beaconing to the C&C. “StyleSmuggler deliberately triggers Magento’s standard ‘Payment Transaction Failed Reminder’ email. Unexpected bursts of these messages are a reason to investigate, although legitimate declined payments can generate the same notification,” Sansec notes. The cybersecurity firm explains that the malicious code is executed when Magento resends the email, as well as when email delivery fails, and that no user interaction is required for successful exploitation. “Sansec found the campaign on September 4th, 22:40 UTC and reproduced the chain on clean installations within hours,” Sansec notes. Adobe is expected to roll out scheduled fixes on September 8, as part of its monthly Patch Tuesday updates, but it is unclear when StyleSmuggler will be addressed. SecurityWeek has emailed Adobe for a statement and will update this article if the company responds. Related: HPE Patches Critical RCE Vulnerabilities in AOS-CX Related: Cisco Warns of Unpatched Secure Email Flaws, Patches Critical Switch Vulnerabilities Related: Sangoma Switchvox Vulnerabilities Exploited in the Wild Related: 12-Year-Old PostgreSQL Vulnerability Enables Database, Server Takeover Written By Ionut Arghire Ionut Arghire is an international correspondent for SecurityWeek. 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