Pierluigi Paganini
October 23, 2025
E-commerce security company Sansec researchers warn that threat actors are exploiting a critical flaw in Adobe Commerce and Magento, tracked as CVE-2025-54236 (CVSS 9.1), to hijack customer accounts via the REST API. The experts observed over 250 attacks hit stores in 24 hours.
Last month, Adobe issued an emergency patch to fix the flaw, dubbed SessionReaper, after researcher Blaklis responsibly disclosed it.
The vulnerability is an improper input validation issue.
“The bug, dubbed SessionReaper and assigned CVE-2025-54236, allows customer account takeover and unauthenticated remote code execution under certain conditions.” reported cybersecurity firm Sansec. “SessionReaper is one of the more severe Magento vulnerabilities in its history, comparable to Shoplift (2015), Ambionics SQLi (2019), TrojanOrder (2022) and CosmicSting (2024). Each time, thousands of stores got hacked, sometimes within hours of the flaw being published.”
An attacker can exploit this vulnerability to take over customer accounts.
The situation is critical, as only 38% of stores are patched and exploit details are already publicly available.
“When we first reported on SessionReaper in September, fewer than one in three Magento stores had been patched. Six weeks later, that figure has barely improved: only 38% of stores are now protected. This means that 62% of Magento stores remain vulnerable to a critical remote code execution attack with publicly available exploit details.” reads the report published by Sancec.
“With exploit details now public and active attacks already observed, we expect mass exploitation within the next 48 hours. Automated scanning and exploitation tools typically emerge quickly after technical writeups are published, and SessionReaper’s high impact makes it an attractive target for attackers.”
SessionReaper matches past major flaws like CosmicSting, TrojanOrder, and Shoplift, which each led to thousands of store breaches within hours.
Sansec blocked over 250 SessionReaper attack attempts on e-commerce sites, with payloads delivering PHP webshells or phpinfo probes from multiple IPs.
Sansec spotted attacks coming from the following IPs:
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(SecurityAffairs – hacking, CVE-2025-54236)
