CVE-2021-20866 describes a missing authorization vulnerability in Advanced Custom Fields (ACF) and ACF Pro versions prior to 5.11, allowing unauthorized access to user list information. Rated 6.5 Medium on the CVSS scale, this vulnerability requires low privileges and network access for an attacker to achieve high confidentiality impact without user interaction. While no public exploit code or active exploitation has been observed, and community discussion is minimal, organizations using affected ACF versions should prioritize patching to mitigate this information disclosure risk.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 5.11CPE matchmatch criteria | cpe:2.3:a:advancedcustomfields:advanced_custom_fields:*:*:*:*:*:wordpress:*:* | ||
< 5.11CPE matchmatch criteria | cpe:2.3:a:advancedcustomfields:advanced_custom_fields:*:*:*:*:pro:wordpress:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.
Remediation records are not available for this CVE.