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Advanced Custom Fields <= 6.3.8 — Authenticated (Admin+) Limited Arbitrary Function Call

CVE-2024-9529Published · Updated

Action summary

Advanced Custom Fields (ACF®): Affected: ≤6.3.6.2Update to 6.3.6.3 or newer

Advanced Custom Fields Pro: Affected: ≤6.3.8Update to 6.3.9 or newer

All remediation steps
Watch plugin
Severity
Medium5.1
CVSS
5.1
CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:L/I:L/A:L
What does this vector mean?
AV:N Attack vector
Network
AC:H Attack complexity
High
PR:H Privileges required
High
UI:R User interaction
Required
S:C Scope
Changed
C:L Confidentiality
Low
I:L Integrity
Low
A:L Availability
Low
Weakness
CWE-94 Improper Control of Generation of Code
Required access
Unknown
Exploit prediction (EPSS)
No score
CISA KEV
Not listed
On this page8

Am I affected?

Advanced Custom Fields (ACF®) advanced-custom-fields

  1. Affected≤ 6.3.6.2
  2. Patched in6.3.6.3

Update to 6.3.6.3 or newer.

You are affected if you run ≤ 6.3.6.2. Version 6.3.6.3 and later are not affected by this issue.

Advanced Custom Fields Pro advanced-custom-fields-pro

  1. Affected≤ 6.3.8
  2. Patched in6.3.9

Update to 6.3.9 or newer.

You are affected if you run ≤ 6.3.8. Version 6.3.9 and later are not affected by this issue.

  • Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under Advanced Custom Fields (ACF®).
  • No admin access? Run a passive check of your site. It reads public files only.

What to do

  1. Update to version 6.3.6.3, or a newer patched version
  2. Update to version 6.3.9, or a newer patched version
  3. Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
  4. Watch Advanced Custom Fields (ACF®) to get an email when the next vulnerability is published.

Advisory

Source description from Wordfence Intelligence, credited to Automattic.

The Advanced Custom Fields (ACF) plugin for WordPress is vulnerable to limited arbitrary function calls via the 'register_meta_box_cb' and 'meta_box_cb' parameters in all versions up to, and including, 6.3.8 (excluding 6.3.6.2) due to insufficient input validation on those parameters. This makes it possible for authenticated attackers, with administrator-level access, to inject arbitrary functions, like WordPress functions, in custom post types that will execute whenever a user accesses the injected post type. This can be leveraged to trick other users like administrators accessing posts into performing unauthorized actions through functions, and is not a very serious risk for the vast majority of site owners. Please follow the reference listed in this vulnerability record for instructions on how to update to the latest version of ACF that patches this issue and ensures accessibility to updates moving forward. Please note this issue was partially patched in 6.3.8 and 6.3.6.1 - 6.3.6.2, however, was hardened further in 6.3.6.3 and 6.3.9.

Exploits & references

Proof-of-concept & detection

No public proof-of-concept or detection template is known for this vulnerability.

Advisories & patches

More in Advanced Custom Fields (ACF®)

All 26
More vulnerabilities in Advanced Custom Fields (ACF®)
SeverityVulnerabilityCVEPublished
High7.2Unauthenticated Stored Cross-Site Scripting
≤6.8.10Update to 6.8.11
CVE-2026-110813
Medium4.3Authenticated (Contributor+) Information Exposure
≤6.8.10Update to 6.8.11
CVE-2026-97189
Medium4.36.8.10 - Authenticated (Contributor+) Insecure Direct Object Reference
6.2.0 – 6.8.10Update to 6.8.11
CVE-2026-97190
Medium4.3Missing Authorization
≤6.8.10Update to 6.8.11
CVE-2026-97191
Medium5.3Unauthenticated Arbitrary Post Modification via Front-End Form '_post_title' and '_post_content' Parameters
≤6.8.1Update to 6.8.2
CVE-2026-8382

Timeline

  1. CVE published

    Severity medium, CVSS 5.1

  2. Record last updated

Sources & licenses

Wordfence record
Vulnerability data
Wordfence Intelligence. Copyright 2012-2026 Defiant Inc. Licensed under the CC BY-SA 4.0.
CVE® identifiers
Copyright 1999-2026 The MITRE Corporation. Used under the CVE Program. CVE® is a registered trademark of The MITRE Corporation.
CVSS / CWE
National Vulnerability Database (NVD), shown unmodified. This product uses the NVD API but is not endorsed or certified by the NVD.
VulnCrest content
Summary, remediation guidance and page layout © VulnCrest. Not sourced from NVD.

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