Advanced Custom Fields: Extended: Privilege escalation or authentication bypass
Advanced Custom Fields: Extended is affected by privilege escalation or authentication bypass. The vulnerable path is reachable without authentication. A successful request can grant permissions or access that the caller should not possess.
- Component
- Advanced Custom Fields: Extended
- Plugin slug
acf-extended- Affected
- See vendor advisory
- Safe version
- See mitigation notes
- Published
- Jan 20, 2026
This CVE was published Jan 20, 2026 and is one of 4 known issues for this plugin.
Update, patch or deactivate.
Update Advanced Custom Fields: Extended to a release outside the affected range, or disable and remove it until a fixed version is available.
No confirmed safe version is listed. Consider a vendor-supported patch or temporarily restricting the affected functionality while you assess the risk.
Deactivate only when warranted by your risk profile, or when advised by your hosting provider in the limited circumstances where the vulnerability cannot otherwise be mitigated. If you’re unsure which action is appropriate, contact Fused or your hosting provider for guidance.
Technical description
The Advanced Custom Fields: Extended plugin for WordPress is vulnerable to Privilege Escalation in all versions up to, and including, 0.9.2.1. This is due to the 'insert_user' function not restricting the roles with which a user can register. This makes it possible for unauthenticated attackers to supply the 'administrator' role during registration and gain administrator access to the site. Note: The vulnerability can only be exploited if 'role' is mapped to the custom field.
CVE / CNA vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H