Advanced Custom Fields <= 6.4.2. — HTML Injection
CVE-2025-54940Published · Updated Action summary
Affected: ≤6.4.2Update to 6.4.3 or newer
All remediation steps- Severity
- Medium4.1
- CVSS
- 4.1CVSS 3.0 · CNA (Wordfence)
CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:L/A:NWhat does this vector mean?
AV:NAttack vector- Network
AC:LAttack complexity- Low
PR:HPrivileges required- High
UI:NUser interaction- None
S:CScope- Changed
C:NConfidentiality- None
I:LIntegrity- Low
A:NAvailability- None
- Weakness
- CWE-20 Improper Input Validation
- 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
- Affected≤ 6.4.2
- Patched in6.4.3
Update to 6.4.3 or newer.
You are affected if you run ≤ 6.4.2. Version 6.4.3 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
- Update to version 6.4.3, or a newer patched version
- Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
- Watch Advanced Custom Fields (ACF®) to get an email when the next vulnerability is published.
Advisory
Source description from Wordfence Intelligence, credited to Shogo Kumamaru.
The Advanced Custom Fields (ACF®) plugin for WordPress is vulnerable to HTML Injection in all versions up to, and including, 6.4.2. This is due to the plugin nor properly neutralizing unsafe HTML. This makes it possible for authenticated attackers, with administrator-level access and above, to inject potentially malicious HTML.
Exploits & references
Proof-of-concept & detection
No public proof-of-concept or detection template is known for this vulnerability.
Advisories & patches
- Advisorywordfence.com
Related CVEs
More in Advanced Custom Fields (ACF®)
All 26| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| High7.2 | Unauthenticated Stored Cross-Site Scripting ≤6.8.10Update to 6.8.11 | CVE-2026-110813 | |
| Medium4.3 | Authenticated (Contributor+) Information Exposure ≤6.8.10Update to 6.8.11 | CVE-2026-97189 | |
| Medium4.3 | 6.8.10 - Authenticated (Contributor+) Insecure Direct Object Reference 6.2.0 – 6.8.10Update to 6.8.11 | CVE-2026-97190 | |
| Medium4.3 | Missing Authorization ≤6.8.10Update to 6.8.11 | CVE-2026-97191 | |
| Medium5.3 | Unauthenticated Arbitrary Post Modification via Front-End Form '_post_title' and '_post_content' Parameters ≤6.8.1Update to 6.8.2 | CVE-2026-8382 |
- High7.2Unauthenticated Stored Cross-Site Scripting
≤6.8.10Update to 6.8.11
- Medium4.3Authenticated (Contributor+) Information Exposure
≤6.8.10Update to 6.8.11
- Medium4.36.8.10 - Authenticated (Contributor+) Insecure Direct Object Reference
6.2.0 – 6.8.10Update to 6.8.11
- Medium4.3Missing Authorization
≤6.8.10Update to 6.8.11
- Medium5.3Unauthenticated Arbitrary Post Modification via Front-End Form '_post_title' and '_post_content' Parameters
≤6.8.1Update to 6.8.2
Timeline
CVE published
Severity medium, CVSS 4.1
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.