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CVE-2020-28037: is_blog_installed in wp-includes/functions.php in WordPress before 5.5.2 improperly determines whether WordPress is already installed, which might allow an attacker to perform a new installation, lead

critical Affects WordPress core. Feed 2026.10.29.4, updated 2026-10-29; published ; advisory modified .

is_blog_installed in wp-includes/functions.php in WordPress before 5.5.2 improperly determines whether WordPress is already installed, which might allow an attacker to perform a new installation, lead

Package
WordPress core WordPress
Affected versions
<5.5.2
Fixed in
5.5.2
Severity
critical  CVSS 9.8
Exploitation
not on CISA KEV · EPSS 8% (94.8th percentile)
Published
2020-11-02
Source
nvd

References

CWE-754
NVD recordWordPress core 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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