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Vulnerability record · CVE-2021-44223 · published 25 November 2021

CVE-2021-44223: Wordpress vulnerability

Wordpress · Wordpress

WordPress before 5.8 lacks support for the Update URI plugin header. This makes it easier for remote attackers to execute arbitrary code via a supply-chain attack against WordPress installations that use any plugin for which the slug satisfies the naming constraints of the WordPress.org Plugin Directory but is not yet present in that directory.

9.8 CVSS 3.1 Critical EPSS 29% · top 1.9%
9.8CVSS 3.1 base score, v2 7.5
29%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

WordPress before 5.8 lacks support for the Update URI plugin header. This makes it easier for remote attackers to execute arbitrary code via a supply-chain attack against WordPress installations that use any plugin for which the slug satisfies the naming constraints of the WordPress.org Plugin Directory but is not yet present in that directory.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://make.wordpress.org/core/2021/06/29/introducing-update-uri-plugin-header-in-wordpress-5-8/ Release NotesVendor Advisory
https://vavkamil.cz/2021/11/25/wordpress-plugin-confusion-update-can-get-you-pwned/ ExploitThird Party Advisory
https://make.wordpress.org/core/2021/06/29/introducing-update-uri-plugin-header-in-wordpress-5-8/ Release NotesVendor Advisory
https://vavkamil.cz/2021/11/25/wordpress-plugin-confusion-update-can-get-you-pwned/ ExploitThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-44223), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.