CVE-2021-20866

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.

Category

6.5
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.39%
Vendor Advisory advancedcustomfields.com
Affected: Delicious Brains Advanced Custom Fields and Advanced Custom Fields Pro
Published at:
Updated at:

References

Link Tags
https://www.advancedcustomfields.com/ vendor advisory
https://wordpress.org/plugins/advanced-custom-fields/ third party advisory
https://jvn.jp/en/jp/JVN09136401/index.html third party advisory

Frequently Asked Questions

What is the severity of CVE-2021-20866?
CVE-2021-20866 has been scored as a medium severity vulnerability.
How to fix CVE-2021-20866?
To fix CVE-2021-20866, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-20866 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2021-20866 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-20866?
CVE-2021-20866 affects Delicious Brains Advanced Custom Fields and Advanced Custom Fields Pro.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.