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WordPress wordpress core

WordPress Core < 6.4.3 — Authenticated(Administrator+) PHP File Upload

CVE-2018-14028Published · Updated

Action summary

Affected: ≤6.4.2Update to 4.1.40 or 4.2.37 or 4.3.33 or 4.4.32 or 4.5.31 or 4.6.28 or 4.7.28 or 4.8.24 or 4.9.25 or 5.0.21 or 5.1.18 or 5.2.20 or 5.3.17 or 5.4.15 or 5.5.14 or 5.6.13 or 5.7.11 or 5.8.9 or 5.9.9 or 6.0.7 or 6.1.5 or 6.2.4 or 6.3.3 or 6.4.3 or newer

Fixed versions are per release branch: update to the fix for the branch you run.

All remediation steps
Watch core
Severity
Medium6.6
CVSS
6.6
CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
What does this vector mean?
AV:N Attack vector
Network
AC:H Attack complexity
High
PR:H Privileges required
High
UI:N User interaction
None
S:U Scope
Unchanged
C:H Confidentiality
High
I:H Integrity
High
A:H Availability
High
Weakness
CWE-434 Arbitrary File Upload
Required access
Unknown
Exploit prediction (EPSS)
No score
CISA KEV
Not listed
On this page8

Am I affected?

WordPress wordpress

  1. Affected≤ 6.4.2
  2. Patched in4.1.40 / 4.2.37 / 4.3.33 / 4.4.32 / 4.5.31 / 4.6.28 / 4.7.28 / 4.8.24 / 4.9.25 / 5.0.21 / 5.1.18 / 5.2.20 / 5.3.17 / 5.4.15 / 5.5.14 / 5.6.13 / 5.7.11 / 5.8.9 / 5.9.9 / 6.0.7 / 6.1.5 / 6.2.4 / 6.3.3 / 6.4.3

Update to 4.1.40 / 4.2.37 / 4.3.33 / 4.4.32 / 4.5.31 / 4.6.28 / 4.7.28 / 4.8.24 / 4.9.25 / 5.0.21 / 5.1.18 / 5.2.20 / 5.3.17 / 5.4.15 / 5.5.14 / 5.6.13 / 5.7.11 / 5.8.9 / 5.9.9 / 6.0.7 / 6.1.5 / 6.2.4 / 6.3.3 / 6.4.3 or newer.

You are affected if you run ≤ 6.4.2. Version 4.1.40, 4.2.37, 4.3.33, 4.4.32, 4.5.31, 4.6.28, 4.7.28, 4.8.24, 4.9.25, 5.0.21, 5.1.18, 5.2.20, 5.3.17, 5.4.15, 5.5.14, 5.6.13, 5.7.11, 5.8.9, 5.9.9, 6.0.7, 6.1.5, 6.2.4, 6.3.3, 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 WordPress.
  • No admin access? Run a passive check of your site. It reads public files only.

What to do

  1. Update to one of the following versions, or a newer patched version: 4.1.40, 4.2.37, 4.3.33, 4.4.32, 4.5.31, 4.6.28, 4.7.28, 4.8.24, 4.9.25, 5.0.21, 5.1.18, 5.2.20, 5.3.17, 5.4.15, 5.5.14, 5.6.13, 5.7.11, 5.8.9, 5.9.9, 6.0.7, 6.1.5, 6.2.4, 6.3.3, 6.4.3
  2. Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
  3. Watch WordPress to get an email when the next vulnerability is published.

Advisory

Source description from Wordfence Intelligence, credited to Vinicius Marangoni.

In all current versions of WordPress Core before 6.4.3, plugins uploaded via the admin area are not verified as being ZIP files. This allows for PHP files to be uploaded. Once a PHP file is uploaded, the plugin extraction fails, but the PHP file remains in a predictable wp-content/uploads location, allowing for an attacker to then execute the file. This represents a security risk in limited scenarios where an attacker (who does have the required capabilities for plugin uploads) cannot simply place arbitrary PHP code into a valid plugin ZIP file and upload that plugin, because a machine's wp-content/plugins directory permissions were set up to block all new plugins. Please note that this requires administrator or super administrator permissions(on multisite installations) and only impacts heavily locked-down installations where even these users cannot install new plugins. CVE-2024-31210 may be a duplicate of this issue.

Exploits & references

Proof-of-concept & detection

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

Advisories & patches

Same weakness (Arbitrary File Upload)

All Arbitrary File Upload
Other Arbitrary File Upload 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 6.6

  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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