Critical PHP RCE: CVE-2026-109618 and CVE-2026-109619

Adobe Commerce is affected by improper neutralization of special elements in a template engine (CWE-1336), a server-side template injection flaw. An unauthenticated remote attacker can trigger it over the network with no user interaction and low attack complexity. Successful exploitation can run arbitrary code in the context of the current user and, because scope is changed, can yield elevated access or control of a victim account or session, with high impact to confidentiality, integrity, and availability (CVSS 10.0). Storefronts running affected Adobe Commerce builds are at risk; the advisory data does not name version ranges. It is not listed in CISA KEV and no public proof-of-concept is known.

Do: Apply the Adobe security update for this CVE as soon as a fixed release is published, and confirm the installed Adobe Commerce build against Adobe’s bulletin rather than assuming a version range. Until patched, restrict unauthenticated access to storefront and admin template features where possible, review template and email-template configuration for unexpected changes, and monitor for anomalous process execution or session hijacking.

PHP has various global state that temporarily points into request memory. In some scenarios, global state may not be correctly reset, or may be repopulated after being reset. The global state may then refer to request memory even after it has been freed. Subsequent requests may read or branch on this stale state before it is fully initialized. Multiple strategies can trigger this condition and produce remote code execution (RCE).

Adobe Commerce and Magento (including Adobe Commerce B2B) contain an improper neutralization of special elements used in a template engine (CWE-1336), a template-injection flaw that permits arbitrary code execution in the context of the current user. The flaw is reachable over the network by unauthenticated attackers, requires no user interaction, and its changed scope (CVSS 3.1 S:C) means injected code executes beyond the vulnerable component, producing a maximum-severity (CVSS 10.0) remote code execution condition. A successful attacker gains arbitrary code execution on the storefront server; in the observed campaign, intruders installed a Rust backdoor and a PHP web shell (dubbed 'StyleSmuggler') on compromised servers. Any organization running an Adobe Commerce, Adobe Commerce B2B, or Magento storefront is in scope, with internet-facing e-commerce deployments most exposed. Exploitation is confirmed in the wild: the bug was abused as a zero-day before patching and was added to CISA's Known Exploited Vulnerabilities catalog on 2026-09-08.

Do: Apply Adobe's released patches immediately per vendor instructions, prioritizing internet-facing Commerce/Magento storefronts, and ensure compliance with CISA BOD 26-04 timelines for KEV entries. Hunt for 'StyleSmuggler' indicators of compromise, including unexpected Rust backdoor binaries and PHP web shells on hosts, and review template/theme customizations for tampering. Exact fixed version numbers are not included in the available data, so consult Adobe's advisory for the correct patched release for your Commerce/Magento version line.