Read the docs
TI-2021-04524 Aliases CVE-2021-21426GHSA-m496-x567-f98c

Fixes a bug in Zend Framework's Stream HTTP Wrapper

Priority MEDIUM 44CWE-502Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-502.

Summary

Magento-lts is a long-term support alternative to Magento Community Edition (CE). In magento-lts versions 19.4.12 and prior and 20.0.8 and prior, there is a vulnerability caused by the unsecured deserialization of an object. A patch in versions 19.4.13 and 20.0.9 was back ported from Zend Framework 3. The vulnerability was assigned CVE-2021-3007 in Zend Framework.

Why it matters now

EPSS 0.01203 68th percentileScored 2026-11-07
Fix Fixed openmage/magento-lts (Packagist): 19.4.13, 20.0.9

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
OpenMagemagento-ltsup to 19.4.12; up to 20.0.8—No fix listedCNA
—openmage/magento-lts (Packagist)before 19.4.1319.4.13Patch availableGHSA-m496-x567-f98c
—openmage/magento-lts (Packagist)20.0.0 to before 20.0.920.0.9Patch availableGHSA-m496-x567-f98c
  • magento-lts VendorOpenMage Affected up to 19.4.12; up to 20.0.8 Fixed in — No fix listed CNA
  • openmage/magento-lts (Packagist) Vendor— Affected before 19.4.13 Fixed in 19.4.13 Patch available GHSA-m496-x567-f98c
  • openmage/magento-lts (Packagist) Vendor— Affected 20.0.0 to before 20.0.9 Fixed in 20.0.9 Patch available GHSA-m496-x567-f98c

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:openmage:magento:*:*:*:*:lts:*:*:*before 19.4.13; 20.0.0 to before 20.0.9VulnerableOpenMage
  • cpe:2.3:a:openmage:magento:*:*:*:*:lts:*:*:* Versions before 19.4.13; 20.0.0 to before 20.0.9 Vulnerable ·OpenMage

Remediation

  • Fix · GHSA-m496-x567-f98c openmage/magento-lts (Packagist) Fixed in 19.4.13 Advisory →
  • Fix · GHSA-m496-x567-f98c openmage/magento-lts (Packagist) Fixed in 20.0.9 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-21426
  2. 2026-10-03 Alias added: GHSA-m496-x567-f98c

References

Advisory 2

  • TI-2026-20633 OpenMage LTS's Phar Deserialization leads to Remote Code Execution CVSS 3.1HIGH 8.1
  • TI-2026-29239 OpenMage LTS has Customer File Upload Extension Blocklist Bypass that Leads to Remote Code Execution CVSS 4.0HIGH 8.7
  • TI-2023-22272 Magento LTS's guest order "protect code" can be brute-forced too easily CVSS 3.1HIGH 7.5
  • TI-2026-28925 Missing authorization in OpenMage magento-lts CVSS 4.0MEDIUM 5.3
  • TI-2026-20634 OpenMage LTS has Path Traversal Filter Bypass in Dataflow Module CVSS 3.1MEDIUM 4.9
  • TI-2025-39617 OpenMage is vulnerable to XSS in Admin Notifications CVSS 4.0MEDIUM 4.6
See all 17 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences