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CVE-2021-24874: The Newsletter, SMTP, Email marketing and Subscribe forms by Sendinblue WordPress plugin before 3.1.31 does not escape the lang and pid parameter before outputting them back in attributes, leading to

medium Affects newsletter\,-smtp\,-email-marketing-and-subscribe (WordPress plugin). Feed 2026.10.29.3, updated 2026-10-29; published ; advisory modified .

The Newsletter, SMTP, Email marketing and Subscribe forms by Sendinblue WordPress plugin before 3.1.31 does not escape the lang and pid parameter before outputting them back in attributes, leading to

Package
newsletter\,-smtp\,-email-marketing-and-subscribe (WordPress plugin) WordPress
Affected versions
<3.1.31
Fixed in
3.1.31
Severity
medium  CVSS 6.1
Exploitation
not on CISA KEV · EPSS 1% (56.5th percentile)
Published
2022-02-14
Source
nvd

References

CWE-79
NVD recordnewsletter\,-smtp\,-email-marketing-and-subscribe (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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