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Advanced Custom Fields <= 5.10 — Missing Authorization to Information Disclosure

CVE-2021-20866Published · Updated

Action summary

Advanced Custom Fields (ACF®): Affected: <5.11Update to 5.11 or newer

Advanced Custom Fields Pro: Affected: <5.11Update to 5.11 or newer

All remediation steps
Watch plugin
Severity
Medium6.5
CVSS
6.5
CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
What does this vector mean?
AV:N Attack vector
Network
AC:L Attack complexity
Low
PR:L Privileges required
Low
UI:N User interaction
None
S:U Scope
Unchanged
C:H Confidentiality
High
I:N Integrity
None
A:N Availability
None
Weakness
CWE-862 Missing Authorization
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< 5.11
  2. Patched in5.11

Update to 5.11 or newer.

You are affected if you run < 5.11. Version 5.11 and later are not affected by this issue.

Advanced Custom Fields Pro advanced-custom-fields-pro

  1. Affected< 5.11
  2. Patched in5.11

Update to 5.11 or newer.

You are affected if you run < 5.11. Version 5.11 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 5.11, or a newer patched version
  2. Update to version 5.11, 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 Keitaro Yamazaki.

Advanced Custom Fields versions prior to 5.11 and Advanced Custom Fields Pro versions prior to 5.11 contain a missing authorization vulnerability in obtaining the user list which may allow a user to obtain the unauthorized information via unspecified vectors.

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

Same weakness (Missing Authorization)

All Missing Authorization
Other Missing Authorization vulnerabilities
SeverityVulnerabilityCVEPublished
High7.2Unauthenticated Stored Cross-Site Scripting via Comment User-Agent Header
EZ SQL Reports Shortcode Widget and DB Backup≤5.25.25Update to 5.26.45
CVE-2026-120688
Critical9.8Unauthenticated Arbitrary File Upload via File Upload via Public Form Submission
Chatterbug Forms – Fast, Flexible WordPress Form Builder≤1.0.2Update to 1.1
CVE-2026-125055
Critical9.8Unauthenticated PHP Object Injection to Remote Code Execution via 'form' Parameter
ELEX WordPress HelpDesk & Customer Ticketing System≤3.3.9Update to 3.4.0
CVE-2026-119077
Medium5.3Unauthenticated Sensitive Information Exposure in 'search' Parameter
Customer Reviews for WooCommerce≤5.127.0Update to 5.128.0
CVE-2026-121518

Timeline

  1. CVE published

    Severity medium, CVSS 6.5

  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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