CVE-2021-44223

CriticalCVSS 9.8/10Last modified Jun 17, 2026

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.

Metrics

CVSS 3.1 9.8/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected software

No affected versions have been published.

Timeline

Published
Nov 25, 2021
Last modified
Jun 17, 2026
NVD status
Modified

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CVE-2021-44223: Critical severity, CVSS 9.8 | Vulnix