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Servers and applications · WordPress plugins

CVE-2021-20866

Advanced Custom Fields (ACF®): Missing Authorization

Severity
Medium 6.5
Published
2 Dec 2021
Last changed
17 Jun 2026
Added to UpHeron
21 Oct 2026
Fixed in
5.11
Also known as
EUVD-2021-8275, WPV-7c59e9059ec8
Sources
NVD, WPVulnerability

Description

Advanced Custom Fields versions prior to 5.11 and Advanced Custom Fields Pro versions prior to 5.11 contain a missing authorization vulnerability in obtaining the user list which may allow a user to obtain the unauthorized information via unspecified vectors.

Affected software

SoftwareAffected versions
Advanced Custom FieldsServers and applications · cpe:a:advancedcustomfields:advanced_custom_fields
  • Every version before 5.11
Advanced Custom FieldsWordPress plugins · wp-plugin:advanced-custom-fields
  • Every version before 5.11

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2021-20866
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2021-20866
  • Wordfence https://www.wordfence.com/threat-intel/vulnerabilities/detail/advanced-custom-fields-510-missing-authorization-to-information-disclosure-2