Security readout for executives and security teams
Plain-English summary
This CVE affects an EC-CUBE 3.0 plugin used for business form output. Older plugin versions can allow a remote attacker to inject script into pages. The business impact is potential customer or administrator browser compromise, depending on where the script runs. The sources do not provide severity scoring or exploitation evidence.
Executive priority
Treat this as a targeted remediation item for EC-CUBE 3.0 environments. Because severity and exploit detail are incomplete, prioritize confirmation and upgrade over broad emergency response unless the vulnerable plugin is internet-facing or used in administrator workflows.
Technical view
CVE-2021-20742 is a cross-site scripting issue in EC-CUBE Business form output plugin for the EC-CUBE 3.0 series before version 1.0.1. JVN and CVE state a remote attacker may inject arbitrary script through an unspecified vector. No CVSS, CWE, payload detail, or affected deployment configuration is provided in the source bundle.
Likely exposure
Exposure is limited to EC-CUBE 3.0 deployments that installed the Business form output plugin at a version earlier than 1.0.1. EC-CUBE installations without this plugin, or with version 1.0.1 or later, are not identified as affected by the provided sources.
Exploitation context
The bundle supports remote script injection but does not identify the exact input, page, authentication state, or user interaction required. KEV is false, and no cited source in the bundle states active exploitation.
Researcher notes
The public description is sparse: vector, privileges, interaction, and impact scope are unspecified. Validation should focus on version confirmation and vendor advisory review. Avoid assuming all EC-CUBE products are affected; the bundle names only the Business form output plugin for EC-CUBE 3.0 series before 1.0.1.
Mitigation direction
- Upgrade the plugin to version 1.0.1 or later where available.
- Check EC-CUBE and JVN guidance for vendor-specific update instructions.
- Prioritize internet-facing EC-CUBE 3.0 storefronts using this plugin.
- Review web application controls for XSS filtering as defense in depth.
Validation and detection
- Inventory EC-CUBE 3.0 sites and installed plugin versions.
- Confirm whether Business form output plugin is below version 1.0.1.
- Review affected sites for unexpected script content in business form output pages.
- Check application logs for suspicious form-related submissions or content changes.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2021-20742 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://www.ec-cube.net/products/detail.php?product_id=959CVE reference · x_refsource_MISC
- https://jvn.jp/en/jp/JVN57524494/index.htmlCVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.