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CVE-2026-128044: Security Vulnerability

CVE-2026-128044 explained: high Security Vulnerability in Product named in vendor advisory. CVSS 8.7. Affected versions, detection, fixes and CTEM priority.

Last updated: Nov 13, 2026

CVSS
8.7 HIGH
EPSS
0.19%
CISA KEV
Not listed
CWE
CWE-346

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

CVE-2026-128044 Overview

OpenMage magento-lts before 20.18.2 and 21.x before 21.0.0-beta3 validates OAuth 1.0a oauth_callback URLs with a string-prefix check and falls back to accepting any well-formed URL. Attackers holding a leaked consumer key and secret can supply host-suffix, userinfo, or arbitrary callback URLs to capture an approving administrator's or customer's request token and verifier, then obtain an access token with the victim's API privileges.

Critical Impact

Remote, authenticated attackers who persuade a user to act can exploit this Security Vulnerability in Product named in vendor advisory. The CVSS base score is 8.7 (High).

Affected Products

  • Product named in vendor advisory: see the vendor advisory for the exact affected versions

Discovery Timeline

  • 2026-11-13: CVE-2026-128044 published to the National Vulnerability Database by disclosure@vulncheck.com
  • 2026-11-13: last updated in the NVD database

Technical Details for CVE-2026-128044

Vulnerability Analysis

CVE-2026-128044 is a Security Vulnerability weakness (CWE-346) in Product named in vendor advisory. 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.

With a CVSS base score of 8.7 and an EPSS exploitation probability of 0.19 percent, apply the vendor fix and confirm exposure on internet facing and business critical assets first.

Root Cause

The vendor description states: OpenMage magento-lts before 20.18.2 and 21.x before 21.0.0-beta3 validates OAuth 1.0a oauth_callback URLs with a string-prefix check and falls back to accepting any well-formed URL. Attackers holding a leaked consumer key and secret can supply host-suffix, userinfo, or arbitrary callback URLs to capture an approving administrator's or customer's request token and verifier, then obtain an access token with the victim's API privileges.

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 high 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:H/AT:P/PR:L/UI:P/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N/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-2026-128044

Detection Strategies

  • Inventory every instance of Product named in vendor advisory 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 Product named in vendor advisory 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-2026-128044

Immediate Actions Required

  • Apply the fixed version of Product named in vendor advisory 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 Product named in vendor advisory.

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-2026-128044 is a high severity Security Vulnerability in a product named in the vendor advisory with a CVSS score of 8.7. Apply the vendor fix and confirm exposure on internet facing and business critical assets first.

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