Adobe disclosed CVE-2024-34102, a critical (CVSS 9.8) pre-authentication XML external entity (XXE) flaw in Adobe Commerce and Magento. The vulnerability lies in recursive REST API deserialization and can be reached through an unauthenticated guest-cart shipping-estimation endpoint, allowing attacker-controlled data to instantiate SimpleXMLElement objects and retrieve local or remote resources.
An attacker could use the flaw to read Magento's app/etc/env.php, exposing the installation's cryptographic key and potentially enabling forged administrator JWTs for privileged Magento API access. Research further indicates the issue could be chained with PHP filter techniques and CVE-2024-2961 toward remote code execution; organizations should apply Adobe's security update, as early third-party emergency mitigations were bypassable and later revised.

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Adobe published a security advisory for CVE-2024-34102, a critical pre-authentication XML external entity injection vulnerability in Adobe Commerce and Magento. Adobe assigned the flaw a CVSS score of 9.8.
Researchers described exploiting recursive Magento REST API deserialization through an unauthenticated guest-cart shipping-estimation endpoint to exfiltrate files such as app/etc/env.php. They also reported that initial emergency mitigations from SanSec and Sergey Temnikov were bypassable before being revised.
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