What is CVE-2026-120534?

CVE-2026-120534 is a critical-severity vulnerability in Acf Extended Advanced Custom Fields: Pro, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 9.8/10. Published 2026-11-03.

How severe is CVE-2026-120534?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Arbitrary file upload in Acf Extended Advanced Custom Fields: Pro

CVE-2026-120534

The Advanced Custom Fields: Extended PRO plugin for WordPress is vulnerable to Limited Code Injection in all versions up to, and including, 0.9.2.6 via the render_field function. This is due to insufficient validation of form configuration parameters before merging into field settings and passing to call_user_func_array in the render_field method. This makes it possible for unauthenticated attackers to call arbitrary WordPress functions with controlled arguments. Method 1 requires the administrator to enable the non-default 'shortcode_preview' setting for the target form, while Method 2 requires the server environment to lack OpenSSL functions, causing ACF Pro's acf_decrypt to fall back to unverified base64 decoding.

Vulnerability class: Unrestricted File Upload

Published 2026-11-03 · last modified 2026-11-03.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Acf Extended Advanced Custom Fields: Pro

Weakness classification (CWE)

CWE-434 — Unrestricted Upload of File with Dangerous Type

References

Frequently asked questions

What is CVE-2026-120534?: CVE-2026-120534 is a critical-severity vulnerability in Acf Extended Advanced Custom Fields: Pro, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 9.8/10. Published 2026-11-03.
How severe is CVE-2026-120534?: Critical severity. CVSS v3 base score is 9.8 out of 10.