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CVE-2026-128049: OpenMage Magento LTS Cross Site Request Forgery Vulnerability

CVE-2026-128049 explained: critical Cross Site Request Forgery in OpenMage Magento LTS. CVSS 9.4. Affected versions, detection, fixes and CTEM priority.

Last updated: Nov 13, 2026

CVSS
9.4 CRITICAL
EPSS
0.23%
CISA KEV
Not listed
CWE
CWE-352

Sources: National Vulnerability Database, CVE.org, CISA KEV, FIRST EPSS

CVE-2026-128049 Overview

OpenMage Magento LTS before 20.18.2 and 21.0.0-beta1 before 21.0.0-beta3 contains a cross-site request forgery vulnerability in the admin and storefront OAuth confirm and confirmSimple actions, which accept GET requests without form-key validation. Attackers holding OAuth consumer credentials can lure a logged-in administrator or customer to a crafted confirm URL that authorizes the attacker's request token, then exchange it at /oauth/token for a persistent REST API access token bound to the victim.

Critical Impact

Remote, authenticated attackers who persuade a user to act can exploit this Cross Site Request Forgery in OpenMage Magento LTS. The CVSS base score is 9.4 (Critical).

Affected Products

  • OpenMage Magento LTS: see the vendor advisory for the exact affected versions

Discovery Timeline

  • 2026-11-13: CVE-2026-128049 published to the National Vulnerability Database by disclosure@vulncheck.com
  • 2026-11-13: last updated in the NVD database

Technical Details for CVE-2026-128049

Vulnerability Analysis

CVE-2026-128049 is a Cross Site Request Forgery weakness (CWE-352: Cross Site Request Forgery) in OpenMage Magento LTS. Based on its CVSS vector, the flaw can be reached over the network, needs some level of access, and relies on a user taking an action. A logged in user's browser can be tricked into sending unwanted requests.

With a CVSS base score of 9.4 and an EPSS exploitation probability of 0.23 percent, apply the vendor fix and confirm exposure on internet facing and business critical assets first.

Root Cause

The weakness is classified as CWE-352: Cross Site Request Forgery. A logged in user's browser can be tricked into sending unwanted requests.

Attack Vector

Based on the CVSS vector, the flaw can be reached over the network, needs some level of access, and relies on a user taking an action. Attack complexity is low complexity.

No exploitation in the wild is confirmed by CISA at the time of the last update. Check the references below for any vendor or researcher proof of concept.

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Detection Methods for CVE-2026-128049

Detection Strategies

  • Inventory every instance of OpenMage Magento LTS and compare the running version with the affected range above.
  • Check external attack surface scans for internet facing instances of the component.
  • Run an authenticated vulnerability scan once your scanner ships a check for this CVE.

Monitoring Recommendations

  • Forward OpenMage Magento LTS application, access and audit logs to your SIEM for retrospective hunting.
  • Alert on new processes, configuration changes or outbound connections from the affected service.
  • Track the vendor advisory and the CISA KEV catalog for changes in exploitation status.

How to Mitigate CVE-2026-128049

Immediate Actions Required

  • Apply the fixed version of OpenMage Magento LTS named in the vendor advisory.
  • Prioritize internet facing and business critical instances first.
  • Rescan after the change to confirm the exposure is closed.

Patch Information

Use the fixed version listed in the vendor advisory for OpenMage Magento LTS.

Workarounds

  • If patching must wait, restrict network access to the affected service and place it behind authentication or a web application firewall rule.

CWE References

Technical References

This entry is built directly from NVD, CISA KEV and EPSS data. Verify fixed versions in the vendor advisory before you deploy.

Frequently asked questions

CVE-2026-128049 is a critical severity Cross Site Request Forgery in OpenMage Magento LTS with a CVSS score of 9.4. Apply the vendor fix and confirm exposure on internet facing and business critical assets first.

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