UpHeron
All vulnerabilities

WordPress core

CVE-2021-44223

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.

Severity
Critical 9.8
Published
25 Nov 2021
Last changed
17 Jun 2026
Added to UpHeron
17 Oct 2026
Fixed in
5.8
Sources
NVD

Affected software

SoftwareAffected versions
WordPressWordPress core · cpe:a:wordpress:wordpress
  • Every version before 5.8

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2021-44223
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2021-44223