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

In short

Adobe Commerce and Magento has a weakness classified as unrestricted upload of file with dangerous type (CWE-434). CISA added it to its Known Exploited Vulnerabilities catalog on 2026-10-27. NVD lists CVSS 3.1 at 9.3 CRITICAL.

What it is

“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.” — CISA KEV, retrieved 2026-11-01

“Adobe Commerce is affected by 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. Exploitation of this issue requires user interaction in that a victim must visit a maliciously crafted URL or interact with a compromised web page. Scope is changed.” — NVD, retrieved 2026-11-01

Who is affected

Adobe Commerce and Magento. NVD lists the following versions as affected:

• Adobe Commerce: version 2.4.4
• Adobe Commerce: version 2.4.5
• Adobe Commerce: version 2.4.6
• Adobe Commerce: version 2.4.7
• Adobe Commerce: version 2.4.8
• Adobe Commerce: version 2.4.9
• Adobe Commerce b2b: version 1.3.3
• Adobe Commerce b2b: version 1.3.4
• Adobe Commerce b2b: version 1.4.2
• Adobe Commerce b2b: version 1.5.2
• Adobe Commerce b2b: version 1.5.3
• Adobe Magento: version 2.4.6
• Adobe Magento: version 2.4.7
• Adobe Magento: version 2.4.8
• Adobe Magento: version 2.4.9
• Adobe i/o Events: from 1.6.0 inclusive, before 1.21.0

Exploitation status

CISA KEV added: 2026-10-27. Known ransomware campaign use: Not reported by CISA. Due date CISA set for US federal civilian agencies: 2026-11-10.

Scores

NVD CVSS 3.1: 9.3 CRITICAL; vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N; source [email protected].

EPSS by FIRST: 44.58%; percentile 98.77; score date 2026-10-31. EPSS estimates the probability of exploitation in the next 30 days.

CWE: CWE-434.

Timeline

CISA required action

“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.” — CISA KEV

What to do

• Confirm whether you run Adobe Commerce and Magento and which version.
• Apply the vendor update or mitigation in the advisory.
• Follow CISA’s required action.
• Review the vendor guidance on signs of compromise.
• Track the fix through completion.

References

• Vendor Advisory: https://helpx.adobe.com/security/products/magento/apsb26-73.html
• Third Party Advisory: https://sansec.io/research/magento-cms-block-loader-deepveindrilling#indicators-of-compromise
• Third Party Advisory: https://sansec.io/research/polyshell-mass-attack-wave
• NVD detail
• CVE.org record
• CISA KEV catalog

Sources and dates

CISA Known Exploited Vulnerabilities Catalog, version 2026.10.30; retrieved 2026-11-01. CISA KEV data: CC0 1.0. No endorsement by CISA.

NVD retrieved: 2026-11-01. This product uses the NVD API but is not endorsed or certified by the NVD.

EPSS scores by FIRST; score date 2026-10-31.