Security readout for executives and security teams
Plain-English summary
CVE-2021-20750 is a cross-site scripting issue in EC-CUBE 3 and 4. An attacker may inject script by convincing an administrator or user to visit a crafted page and take a specific action. For online stores, the main concern is account/session abuse, admin-context actions, or customer-facing script execution.
Executive priority
Treat as a timely remediation item for affected EC-CUBE stores, especially where administrators manage orders, customers, or payment-related workflows. It is not supported as actively exploited in the supplied sources, but XSS in e-commerce administration can still create business risk.
Technical view
The source bundle identifies XSS in EC-CUBE 3.0.0 through 3.0.18-p2 and 4.0.0 through 4.0.5-p1. The attack requires user or administrator interaction with a crafted page and operation. No CVSS, CWE, fixed version, workaround, or exploit details are provided in the bundle.
Likely exposure
Exposure is most likely for internet-facing EC-CUBE storefronts or admin environments running the listed EC-CUBE 3 or 4 versions. Sites outside those version ranges are not identified as affected by the supplied sources.
Exploitation context
The bundle does not show CISA KEV listing or active exploitation evidence. The described path is interaction-dependent, requiring a crafted page and a specific administrator or user operation, so phishing or social engineering context is likely relevant.
Researcher notes
Evidence is limited to the CVE description, affected ranges, KEV false, and EC-CUBE/JVN references. The bundle lacks CVSS, CWE, exploit status, fixed version details, and precise vulnerable parameter or workflow. Avoid asserting exploitability beyond the interaction-dependent XSS described.
Mitigation direction
- Inventory EC-CUBE installations and record exact 3.x or 4.x versions.
- Review EC-CUBE advisories 78 and 79 for fixed releases or patches.
- Apply vendor-confirmed updates or patches for affected EC-CUBE versions.
- Limit administrator exposure to untrusted links until remediation is complete.
- Monitor storefront content and admin activity for unexpected script changes.
Validation and detection
- Confirm whether each deployment matches the affected version ranges.
- Verify remediation status against EC-CUBE and JVN advisory guidance.
- Check public and administrative pages for unexpected injected script content.
- Review recent admin activity for suspicious changes after reported exposure.
- Document any compensating controls when immediate patching is delayed.
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-2021-20750 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=79CVE reference · x_refsource_MISC
- 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.