CVE-2021-20866: Medium severity advanced custom fields vulnerability

Published Dec 13, 2021
·
Updated

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

2 affected components
Advancedcustomfields Advanced Custom Fields Wordpress<5.11
Advancedcustomfields Advanced Custom Fields Wordpress<5.11

Event History

Dec 13, 2021
CVE Published
via MITRE·06:40 AM
Data Sourced
via MITRE·06:40 AM
DescriptionWeakness
Free Weekly Intel

Don't miss critical vulnerabilities

Join thousands of security professionals who receive our weekly digest of trending CVEs, zero-days, and exploited vulnerabilities.

No spam. Unsubscribe anytime.

Frequently Asked Questions

1

What is CVE-2021-20866?

CVE-2021-20866 is a vulnerability found in Advanced Custom Fields versions prior to 5.11 and Advanced Custom Fields Pro versions prior to 5.11.

2

What is the severity of CVE-2021-20866?

The severity of CVE-2021-20866 is rated as medium with a CVSS score of 6.5.

3

What is the affected software for CVE-2021-20866?

The affected software for CVE-2021-20866 is Advanced Custom Fields versions prior to 5.11 and Advanced Custom Fields Pro versions prior to 5.11.

4

How can the CVE-2021-20866 vulnerability be exploited?

The CVE-2021-20866 vulnerability can be exploited by obtaining the user list and unauthorized information via unspecified vectors.

5

Are there any references available for CVE-2021-20866?

Yes, here are some references for CVE-2021-20866: [1] https://jvn.jp/en/jp/JVN09136401/index.html, [2] https://wordpress.org/plugins/advanced-custom-fields/, [3] https://www.advancedcustomfields.com/

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co
By using SecAlerts services, you agree to our services end-user license agreement. This website is safeguarded by reCAPTCHA and governed by the Google Privacy Policy and Terms of Service. All names, logos, and brands of products are owned by their respective owners, and any usage of these names, logos, and brands for identification purposes only does not imply endorsement. If you possess any content that requires removal, please get in touch with us.
© 2026 SecAlerts Pty Ltd.
ABN: 70 645 966 203, ACN: 645 966 203