StyleSmuggler (CVE-2026-75650): Frequently asked questions about Adobe Commerce and Magento zero-day

Adobe Commerce and Magento Open Source versions 2.4.3-p1 and earlier and 2.3.7-p2 and earlier contain an improper input validation flaw (CWE-20) in the checkout process. A remote attacker can trigger it with no privileges and no user interaction by submitting crafted input to a store's checkout flow, and successful exploitation results in arbitrary code execution on the server hosting the storefront. Any Adobe Commerce or Magento Open Source storefront running the affected versions is exposed, and because these are internet-facing e-commerce sites the practical exposure is broad. Exploitation is confirmed in the wild: the flaw is in CISA's Known Exploited Vulnerabilities catalog (added 2022-02-15), its EPSS exploitation probability is 99.2% (100th percentile), and news reports describe ongoing attacks against Magento 2 stores, including recurring 'Xurum' attack campaigns and template-based attacks.

Do: Upgrade every store to an Adobe-patched release per the vendor's instructions - i.e., any release newer than 2.4.3-p1 on the 2.4.x line or newer than 2.3.7-p2 on the 2.3.x line - noting that headlines indicate companion Magento CVEs were fixed in the same patch release, so consult Adobe's advisory for the full list. Because exploitation is unauthenticated and confirmed in the wild, prioritize internet-facing shops; WAF rules may reduce risk, but reports indicate WAF bypasses in related Magento attacks, so patching is the only reliable fix. After patching, review web server and application logs for exploitation attempts against the checkout flow and check affected hosts for indicators of compromise.

CVE-2024-34102 is an improper restriction of XML external entity reference (XXE) vulnerability (CWE-611) in Adobe Commerce and Magento Open Source, where the platform does not properly restrict external entities when processing XML, so an attacker who can submit crafted XML containing external entity references can have it parsed with attacker-controlled resources. XXE flaws classically enable local file disclosure and server-side request forgery, and in this case Adobe states the flaw allows remote code execution on the affected server. Any organization running a vulnerable Adobe Commerce or Magento Open Source storefront is affected, and because these are internet-facing e-commerce platforms that routinely process XML input, exposure is likely to be broad. The vulnerability was added to CISA's Known Exploited Vulnerabilities catalog on 2024-07-17, confirming exploitation in the wild, and its EPSS score of ~100% (100th percentile) indicates near-certain near-term exploitation activity; no public proof-of-concept is known and CVSS has not yet been scored. CISA lists ransomware use as unknown, so a ransomware connection should not be assumed.

Do: Apply Adobe's security updates for Adobe Commerce and Magento Open Source per the vendor's June 2024 advisory (APSB24-40), or, per the CISA KEV required action, apply vendor-recommended mitigations or discontinue use of the product if patches are unavailable. Review any endpoints or integrations that accept XML from untrusted users and hunt for signs of XXE exploitation, such as unexpected outbound requests, anomalous file reads, or webshell artifacts. Continue monitoring Adobe and CISA KEV for updated mitigation guidance and remediation deadlines.

Adobe Commerce and Magento Open Source contain an improper input validation flaw (CWE-20), widely tracked as 'SessionReaper', that lets a remote, unauthenticated attacker take over user sessions. The flaw is exploitable over the network with no privileges and no user interaction (CVSS 3.1 9.1, critical). A successful attacker hijacks legitimate customer or admin sessions, yielding high confidentiality and integrity impact; a public writeup additionally describes unauthenticated exploitation potentially reaching code execution. Anyone running Adobe Commerce (including Commerce B2B) or Magento Open Source on the affected 2.4.x releases is exposed. Exploitation is confirmed in the wild: CISA added the flaw to its KEV catalog on 2025-10-24, reporting headlines cite over 250 observed attacks, EPSS is 94.5%, and roughly 3 in 5 stores were reported as still unpatched.

Do: Immediately upgrade every affected 2.4.x line to a release newer than 2.4.9-alpha2/2.4.8-p2/2.4.7-p7/2.4.6-p12/2.4.5-p14/2.4.4-p15 per Adobe's security advisory. Because the flaw is on CISA's KEV list, federal agencies must apply the vendor's mitigations (or BOD 22-01 cloud guidance) or discontinue use; other defenders should prioritize patching given 250+ observed attacks and 94.5% EPSS. Until patched, watch for indicators of session takeover — unexpected customer or admin sessions, unfamiliar admin accounts, and anomalous session activity — and review Adobe's advisory for interim mitigations.

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.