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CVE-2019-11843: The MailPoet plugin before 3.23.2 for WordPress allows remote attackers to inject arbitrary web script or HTML using extra parameters in the URL (Reflective Server-Side XSS).

medium Affects mailpoet (WordPress plugin). Feed 2026.10.29.4, updated 2026-10-29; published ; advisory modified .

The MailPoet plugin before 3.23.2 for WordPress allows remote attackers to inject arbitrary web script or HTML using extra parameters in the URL (Reflective Server-Side XSS).

Package
mailpoet (WordPress plugin) WordPress
Affected versions
<3.23.2
Fixed in
3.23.2
Severity
medium  CVSS 6.1
Exploitation
not on CISA KEV · EPSS 2% (78.4th percentile)
Published
2020-06-02
Source
nvd

References

CWE-79
NVD recordmailpoet (WordPress plugin) advisories

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# PHP projects (recommended)
composer require --dev phpwarden/phpwarden
# then
vendor/bin/phpwarden wordpress /var/www/html

# or, without Composer
pipx install phpwarden   &&   phpwarden wordpress /var/www/html

Or keep it checked automatically with the GitHub Action or a nightly cron; see WordPress docs.

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