CVE-2020-28032: WordPress before 5.5.2 mishandles deserialization requests in wp-includes/Requests/Utility/FilteredIterator.php.

critical Affects WordPress core. Feed 2026.10.29.1, updated 2026-10-28; published 2020-11-02; advisory modified 2026-06-17.

WordPress before 5.5.2 mishandles deserialization requests in wp-includes/Requests/Utility/FilteredIterator.php.

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 16% (96.8th percentile)
Published: 2020-11-02
Source: nvd

References

CWE-502

NVD record WordPress core advisories

Am I affected?

Find out in one command. phpwarden checks your WordPress install against this advisory and 20,000+ others, ranked by real-world exploitation (CISA KEV + EPSS). Free, offline, open data.

# one-time install
pip install phpwarden

# then
phpwarden wordpress /var/www/html

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

Install docs How findings are ranked

Related advisories

CVE-2026-63030 KEV critical WordPress 6.9.x before 6.9.5 and 7.0.x before 7.0.2 is affected by a REST API batch endpoi same package: WordPress core
CVE-2026-60137 KEV medium WordPress 6.8.x before 6.8.6, 6.9.x before 6.9.5, and 7.0.x before 7.0.2 does not properly same package: WordPress core
CVE-2022-21661 high WordPress is a free and open-source content management system written in PHP and paired wi same package: WordPress core
CVE-2019-8943 medium WordPress through 5.0.3 allows Path Traversal in wp_crop_image(). An attacker (who has pri same package: WordPress core
CVE-2017-5487 medium wp-includes/rest-api/endpoints/class-wp-rest-users-controller.php in the REST API implemen same package: WordPress core
CVE-2021-29447 high Wordpress is an open source CMS. A user with the ability to upload files (like an Author) same package: WordPress core