Advanced Custom Fields <= 5.7.11 - PHP Object Injection

Deserialization of Untrusted Data
CVSS 5.4 (Medium)
Publicly Published February 15, 2019
Last Updated January 18, 2023
Researcher Slavco Mihajloski


Advanced Custom Fields before 5.7.12 fails to sanitize user-supplied input before passing it to the unserialize() function. This allows low-level authenticated users to call PHP Objects and possibly achieve remote code execution if a usable gadget is present in a plugin or theme installed on the same site as the vulnerable plugin.



1 affected software package

Software Type Plugin
Software Slug advanced-custom-fields (view on
Patched? Yes
Remediation Update to version 5.7.12, or a newer patched version
Affected Version
  • <= 5.7.11
Patched Version
  • 5.7.12

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