PT-2021-24067 · WordPress · Post Smtp Mailer

Jerome Bruandet · Published 2021-12-14 · Updated 2025-06-04 · CVE-2021-4422

Positive Technologies (AI Summary)

CVSS v3.1

4.3

Medium

Base vector

AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

Name of the Vulnerable Software and Affected Versions: POST SMTP Mailer plugin for WordPress versions up to, and including, 2.0.20

Description: The issue is related to Cross-Site Request Forgery due to missing or incorrect nonce validation on the handleCsvExport() function. This allows unauthenticated attackers to trigger a CSV export via a forged request if they can trick a site administrator into performing an action such as clicking on a link.

Recommendations: For versions up to, and including, 2.0.20, update to a version that includes the fix for the missing or incorrect nonce validation on the handleCsvExport() function. As a temporary workaround, consider restricting access to the handleCsvExport() function to minimize the risk of exploitation.

Fix

CSRF

Weakness Enumeration

CWE-352

Related Identifiers

CVE-2021-4422

Affected Products

Post Smtp Mailer

References · 15

• https://nvd.nist.gov/vuln/detail/CVE-2021-4422 · Security Note
• https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=2473579%40post-smtp&new=2473579%40post-smtp&sfp_email=&sfph_mail= · Patch
• https://osv.dev/vulnerability/CVE-2021-4422 · Vendor Advisory
• https://t.me/cvenotify/124604 · Telegram Post
• https://t.me/cybersecuritytechnologies/5115 · Telegram Post
• https://t.me/nekaspersky/1550 · Telegram Post
• https://blog.nintechnet.com/25-wordpress-plugins-vulnerable-to-csrf-attacks · Note
• https://blog.nintechnet.com/multiple-wordpress-plugins-fixed-csrf-vulnerabilities-part-2 · Note
• https://blog.nintechnet.com/multiple-wordpress-plugins-fixed-csrf-vulnerabilities-part-5 · Note
• https://blog.nintechnet.com/multiple-wordpress-plugins-fixed-csrf-vulnerabilities-part-3 · Note
• https://blog.nintechnet.com/more-wordpress-plugins-and-themes-vulnerable-to-csrf-attacks · Note
• https://t.me/cibsecurity/66474 · Telegram Post
• https://blog.nintechnet.com/multiple-wordpress-plugins-fixed-csrf-vulnerabilities-part-1 · Note
• https://blog.nintechnet.com/multiple-wordpress-plugins-fixed-csrf-vulnerabilities-part-4 · Note
• https://wordfence.com/threat-intel/vulnerabilities/id/e018ca7c-06dd-4d40-91d4-4ed188b8aaf2?source=cve · Note