Security readout for executives and security teams
Plain-English summary
This WordPress plugin issue lets an attacker abuse an administrator’s browser to trigger a CSV export action. It requires tricking an admin into clicking or loading something, so it is not a direct server takeover. Business risk is mainly unauthorized operational action and possible data-handling concern around exported mail-log CSVs.
Executive priority
Treat as a moderate WordPress maintenance item. It should be remediated in normal patch cycles, faster for sites handling sensitive email logs or with many admin users. There is no supplied evidence of active exploitation or critical impact.
Technical view
CVE-2021-4422 is a CWE-352 CSRF flaw in POST SMTP Mailer up to and including 2.0.20. The reported issue is missing or incorrect nonce validation in handleCsvExport(), allowing an unauthenticated attacker to cause a CSV export through a forged request when an authenticated administrator performs attacker-induced interaction.
Likely exposure
Exposure is limited to WordPress sites running POST SMTP Mailer versions up to and including 2.0.20. Sites without the plugin, or running versions outside the affected range, are not indicated as affected by the supplied sources.
Exploitation context
The CVE is not listed in CISA KEV, and the supplied bundle does not cite active exploitation. Exploitation requires user interaction by a site administrator, reducing likelihood but leaving risk where administrators browse while authenticated to WordPress.
Researcher notes
The key control failure is CSRF protection around handleCsvExport(). The source bundle supports unauthenticated request forgery with administrator interaction, integrity impact only in CVSS, and no KEV listing. The bundle does not provide enough evidence to claim data disclosure details beyond CSV export triggering.
Mitigation direction
- Inventory WordPress sites for POST SMTP Mailer installations and versions.
- Update affected installations according to current vendor or WordPress plugin guidance.
- Prioritize sites where administrators regularly stay logged in to WordPress.
- Brief administrators to avoid unsolicited links while authenticated to WordPress.
- Review plugin release notes or vendor advisories before assuming remediation is complete.
Validation and detection
- Confirm whether POST SMTP Mailer is installed on each WordPress site.
- Check plugin versions and flag any up to and including 2.0.20.
- Verify the CSV export path has proper nonce validation after updating.
- Review administrative activity for unexpected CSV export events, if logs are available.
- Document unaffected sites with plugin absence or non-affected version evidence.
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-2021-4422 mapping review
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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/e018ca7c-06dd-4d40-91d4-4ed188b8aaf2?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=2473579%40post-smtp&new=2473579%40post-smtp&sfp_email=&sfph_mail=CVE 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.