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CVE-2023-0816: The Formidable Forms WordPress plugin before 6.1 uses several potentially untrusted headers to determine the IP address of the client, leading to IP Address spoofing and bypass of anti-spam protection

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

The Formidable Forms WordPress plugin before 6.1 uses several potentially untrusted headers to determine the IP address of the client, leading to IP Address spoofing and bypass of anti-spam protection

Package
formidable-form-builder (WordPress plugin) WordPress
Affected versions
<6.1
Fixed in
6.1
Severity
medium  CVSS 6.5
Exploitation
not on CISA KEV · EPSS 0% (42.6th percentile)
Published
2023-03-27
Source
nvd

References

CWE-290
NVD recordformidable-form-builder (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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