Security readout for executives and security teams
Plain-English summary
CVE-2021-4411 affects the WP EasyPay Square payment plugin for WordPress through version 3.2.0. A malicious site or link could cause a logged-in administrator’s browser to trigger a transaction export action. The cited sources do not show active exploitation, but affected payment or donation sites should still remediate because administrators handle sensitive operational workflows.
Executive priority
Treat as a moderate-priority WordPress plugin issue. It is not known to be actively exploited, but payment-related sites should update quickly because the vulnerable action concerns transaction handling and depends on administrator exposure to social engineering.
Technical view
The issue is CWE-352 cross-site request forgery caused by missing or incorrect nonce validation in wpep_download_transaction_in_excel(). Exploitation requires user interaction from a site administrator. The published CVSS 3.1 score is 4.3, with network attack vector, low complexity, no privileges, required user interaction, and low integrity impact.
Likely exposure
Exposure is limited to WordPress sites running WP EasyPay – Square for WordPress versions up to and including 3.2.0. Practical risk depends on whether administrators are logged in and can be induced to visit attacker-controlled content.
Exploitation context
The source bundle marks KEV as false and provides no cited evidence of active exploitation. The vulnerability is not directly exploitable without administrator interaction. Sources describe a forged request scenario, not unauthenticated direct compromise.
Researcher notes
Primary evidence identifies a CSRF weakness in wpep_download_transaction_in_excel() due to nonce validation failure. The affected range is stated as through 3.2.0. The bundle includes WordPress Trac references, but it does not provide enough detail here to independently assess patch completeness.
Mitigation direction
- Inventory WordPress sites for WP EasyPay and confirm installed versions.
- Update WP EasyPay beyond 3.2.0 where available and supported.
- Disable or remove the plugin if no supported fixed release is available.
- Review vendor, WordPress plugin, and Wordfence guidance for current remediation details.
- Reinforce administrator anti-phishing controls and avoid persistent admin sessions.
Validation and detection
- Confirm whether WP EasyPay is installed on each WordPress site.
- Check plugin version and flag versions 3.2.0 or earlier.
- Review administrative audit logs for unexpected transaction export activity.
- Verify remediated instances no longer expose the affected plugin version.
- Confirm administrators use separate accounts and current WordPress security controls.
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 lookupCVE-2021-4411 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
- Medium
- CVSS
- 4.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
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:N/I:L/A:N2.81.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
4.3MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://www.wordfence.com/threat-intel/vulnerabilities/id/a1fbb3a6-fcc2-47c5-a086-331e69292add?source=cveCVE reference
- https://blog.nintechnet.com/25-wordpress-plugins-vulnerable-to-csrf-attacks/CVE reference
- https://blog.nintechnet.com/more-wordpress-plugins-and-themes-vulnerable-to-csrf-attacks/CVE reference
- https://blog.nintechnet.com/multiple-wordpress-plugins-fixed-csrf-vulnerabilities-part-3/CVE reference
- https://blog.nintechnet.com/multiple-wordpress-plugins-fixed-csrf-vulnerabilities-part-2/CVE reference
- https://blog.nintechnet.com/multiple-wordpress-plugins-fixed-csrf-vulnerabilities-part-1/CVE reference
- https://blog.nintechnet.com/multiple-wordpress-plugins-fixed-csrf-vulnerabilities-part-5/CVE reference
- https://blog.nintechnet.com/multiple-wordpress-plugins-fixed-csrf-vulnerabilities-part-4/CVE reference
- https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=2551919%40wp-easy-pay&new=2551919%40wp-easy-pay&sfp_email=&sfph_mail=CVE reference
- https://plugins.trac.wordpress.org/browser/wp-easy-pay/trunk/wpep_setup.php?rev=2426641#L219CVE reference
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.