Security readout for executives and security teams
Plain-English summary
CVE-2021-4096 affects the WordPress Fancy Product Designer plugin up to version 4.7.5. It could let an attacker abuse a victim's browser interaction to upload malicious files, potentially leading to server compromise. This matters most for WordPress sites using the plugin in ecommerce or design workflows.
Executive priority
Treat this as high priority for any public WordPress site using Fancy Product Designer. Prioritize ecommerce or revenue-facing sites first because successful abuse could become full server compromise.
Technical view
The issue is a CSRF flaw in the FPD_Admin_Import class combined with arbitrary file upload risk. Sources describe possible malicious file upload and webshell access. CVSS 3.1 is 8.8, with network attack vector, low complexity, no attacker privileges, and required user interaction.
Likely exposure
Exposure is limited to WordPress sites running Fancy Product Designer versions up to and including 4.7.5. Internet-facing admin sessions and sites allowing product-design imports are the primary concern.
Exploitation context
The CVE is not listed as CISA KEV in the provided bundle. The sources do not prove active exploitation. The risk is credible because CSRF plus arbitrary upload can lead to webshell access if successfully abused.
Researcher notes
Evidence supports CSRF to arbitrary file upload through FPD_Admin_Import. The provided bundle does not name a fixed version, patch commit, or confirmed exploitation. Avoid assuming active exploitation without additional sourced evidence.
Mitigation direction
- Identify all WordPress sites using Fancy Product Designer.
- Check vendor and Wordfence guidance for the fixed or recommended version.
- Update, remove, or disable vulnerable plugin versions where vendor guidance supports that action.
- Restrict WordPress administrator access to trusted networks where practical.
- Monitor upload directories for unexpected executable files.
Validation and detection
- Confirm the installed Fancy Product Designer version on each WordPress site.
- Review WordPress logs for suspicious import or upload activity.
- Inspect upload locations for unexpected PHP or executable files.
- Verify administrative import workflows include CSRF protections per vendor guidance.
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.
CWE-352: User-session and phishing behavior lookup
Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCWE-434: File access and web shell behavior lookup
File traversal and upload weaknesses can lead teams to review file, web shell, execution, and collection telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupFile access behavior lookup
The CVE wording references file access or upload behavior, so file telemetry and web shell review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-4096 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
- High
- CVSS
- 8.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
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 vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H2.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.8HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://www.wordfence.com/vulnerability-advisories/#CVE-2021-4096CVE reference · x_refsource_MISC
- https://support.fancyproductdesigner.com/support/discussions/topics/13000031615CVE 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.
Cross-Site Request Forgery (CSRF)
Cross-Site Request Forgery (CSRF) represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.
Unrestricted Upload of File with Dangerous Type
Unrestricted Upload of File with Dangerous Type represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.