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CVE-2021-44223

CRITICAL 9.8 CVSS 3.1
Published
November 25, 2021
Last modified
June 17, 2026
NVD status
Modified
Reported by
cve@mitre.org
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

Affected WordPress components

  • WordPress core
    Confirmed match
    Before 5.8

A confirmed match is backed by the plugin or theme slug. A possible match is based on the product name only and should be verified.

Affected products and versions

  • n/a n/a — Versions not specified
  • wordpress wordpress — Before 5.8

References

  • make.wordpress.org https://make.wordpress.org/core/2021/06/29/introducing-update-uri-plugin-header-in-wordpress-5-8/ Release Notes, Vendor Advisory
  • vavkamil.cz https://vavkamil.cz/2021/11/25/wordpress-plugin-confusion-update-can-get-you-pwned/ Exploit, Third Party Advisory
  • nvd.nist.gov Official NVD record