ZeroDayAlert

CVE-2026-48356: Adobe Commerce and Magento Unrestricted Upload of File with Dangerous Type Vulnerability

Adobe Commerce and Magento contain an unrestricted upload of file with dangerous type vulnerability that could result in arbitrary code execution in the context of the current user, potentially gaining elevated access or control over the victim's account or session.

Adobe Commerce and Magento Added to KEV 2026-10-27 Federal due 2026-11-10 Known ransomware use

Required action — quoted from CISA

Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

Where this comes from. The identifier, product, dates and required action above are copied verbatim from the CISA Known Exploited Vulnerabilities catalog. The action plan below is written by an AI agent from that record and published automatically. AssurePort has not independently tested this vulnerability and makes no claim about whether any specific system is affected.

Who is affected

Adobe Commerce and Magento installations are vulnerable to arbitrary code execution through an unrestricted file upload weakness. The vulnerability allows an authenticated attacker to upload dangerous file types, potentially leading to code execution with the privileges of the current user or escalation to higher access levels. The record does not specify which versions or deployment configurations (on-premises versus cloud) are in scope.

How to check whether this touches you

  • Inventory whether your organisation runs Adobe Commerce or Magento in any environment (production, staging, development).
  • Confirm whether the instance is reachable from the internet or from an untrusted network where an attacker could authenticate or gain session access.
  • Check your current Adobe Commerce or Magento version number against Adobe's remediation guidance; note that version alone is not definitive proof of exposure, as vendors sometimes backport fixes to older releases.
  • Review file upload functionality in your deployment and any custom extensions that handle uploads, as these are common vectors for this class of defect.

What to do

  1. Immediately consult Adobe's security advisory for CVE-2026-48356 to determine which versions require patching and whether patches are available.
  2. If patches are not yet available or cannot be deployed immediately, restrict file upload features to authenticated users only and implement strict file type validation and size limits at the application and web-server level.
  3. Move upload processing off the web root if possible; block direct execution of uploaded files using .htaccess, web.config, or your web server's configuration.
  4. Enable detailed logging of all file upload attempts, including the user account, file name, file type, and timestamp; forward logs to your security information and event management (SIEM) system if available.
  5. Prioritise patching according to CISA BOD 26-04 timelines for any instance exposed to the internet or accessible by external users.
  6. Escalate to your change advisory board and security team before applying patches to production systems; test in staging first.

If you find you were exposed

Exploitation of unrestricted upload vulnerabilities typically occurs before public disclosure, so review your upload logs, web access logs, and application audit trails for the period preceding this advisory. Look for unusual upload activity, suspicious file names, new user accounts, or web shells in your upload directories. If your log retention window is shorter than weeks or months, consult your backup and forensics procedures to determine whether historical logs are recoverable; retention gaps may limit your ability to confirm whether exploitation took place.

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Knowing it exists is not the same as knowing you are exposed.

This page can tell you that CVE-2026-48356 is being exploited. It cannot tell you whether Commerce and Magento is running somewhere of yours that is reachable. That question is what a scan answers.

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