Security readout for executives and security teams
Plain-English summary
EC-CUBE 4.0.0 through 4.0.5-p1 has a cross-site scripting flaw. An attacker may trick an administrator or user into visiting a crafted page and performing a specific action, allowing arbitrary script injection. Business impact depends on exposed EC-CUBE stores, user privileges, and whether official remediation has been applied.
Executive priority
Treat this as a focused remediation task for any affected EC-CUBE storefront. It is not documented here as actively exploited, but XSS against commerce platforms can affect sessions, trust, and administrative workflows.
Technical view
CVE-2021-20751 is an XSS vulnerability in the EC-CUBE 4 series. The public description states remote attackers can inject arbitrary script through social engineering plus a specific user or administrator operation. The source bundle does not provide CVSS, CWE, detailed vectors, or a confirmed fixed version.
Likely exposure
Organizations running EC-CUBE 4.0.0 to 4.0.5-p1 are potentially exposed, especially internet-facing commerce sites with active administrator or customer workflows.
Exploitation context
The bundle does not cite active exploitation, and KEV is false. Exploitation appears to require luring a user or administrator to a specially crafted page and inducing a specific operation.
Researcher notes
Evidence is limited to the CVE description, vendor advisory reference, and JVN reference. No CVSS, CWE, exploit details, or fixed version is present in the supplied bundle, so conclusions should remain conservative.
Mitigation direction
- Inventory EC-CUBE installations and identify versions 4.0.0 through 4.0.5-p1.
- Review EC-CUBE advisory ID 78 and JVN95292458 for official remediation guidance.
- Apply the vendor-recommended update or configuration change when confirmed from official guidance.
- Limit administrator exposure to untrusted links until remediation is complete.
- Increase monitoring for unexpected script behavior or suspicious administrative-session activity.
Validation and detection
- Confirm EC-CUBE version and deployment scope across production and staging systems.
- Verify whether official EC-CUBE or JVN remediation guidance has been applied.
- Review affected user and administrator workflows for proper output encoding.
- Use authorized security testing to confirm untrusted input cannot execute as script.
- Check security logs for anomalous administrator actions around the advisory window.
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-2021-20751 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/info/weakness/weakness.php?id=78CVE reference · x_refsource_MISC
- https://jvn.jp/en/jp/JVN95292458/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.