Limited Code Injection Vulnerability in Advanced Custom Fields: Extended PRO by WordPress
CVE-2026-120534

9.8CRITICAL

Key Information:

Vendor

WordPress
Status
Advanced Custom Fields: Extended Pro
Vendor
CVE Published:
3 November 2026

What is CVE-2026-120534?

The Advanced Custom Fields: Extended PRO plugin for WordPress contains a vulnerability that allows unauthenticated attackers to exploit limited code injection due to inadequate validation of form configuration parameters. This occurs within the render_field function, where parameters are merged into field settings and passed to call_user_func_array without proper checks. Attackers can execute arbitrary WordPress functions by controlling function arguments. This risk is heightened when the 'shortcode_preview' setting is enabled or when server environments lack OpenSSL support, leading to unverified base64 decoding through ACF Pro's acf_decrypt method.

Affected Version(s)

Advanced Custom Fields: Extended PRO 0 <= 0.9.2.6

References

https://www.wordfence.com/threat-intel/vulnerabilities/id...
https://www.acf-extended.com/changelog

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Tin Pham (TF1T)
Trong Pham (dtro)
Hao Ngo
.