CVE-2026-109218 Details
Description
The Contact Manager plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 9.1.2 via the add_message function. This is due to an incomplete extension blacklist that fails to detect dangerous extensions when a trailing dot causes the extension-derivation routine to return an empty string, which sanitize_file_name() then silently removes before the file is written to disk. This makes it possible for unauthenticated attackers to upload files that may be executable, which makes remote code execution possible. Successful code execution additionally requires the server to use Apache with libapache2-mod-php (which maps .phar to PHP by default) and the attacker to retrieve the uploaded file within the brief window before it is removed by unlink() at end of request.
A vulnerability allowing arbitrary file upload has been identified in the Contact Manager plugin for WordPress, affecting all versions through 9.1.2. The issue arises in the add_message function, where an incomplete extension blacklist fails to properly validate file extensions. When a trailing dot is present, the extension-derivation process returns an empty string, which sanitize_file_name() removes silently before the file is saved. This flaw enables unauthenticated attackers to upload potentially executable files, leading to remote code execution. Successful exploitation requires the server to use Apache with libapache2-mod-php, which by default maps .phar files to PHP, and for the attacker to access the uploaded file before it is deleted by unlink() at the end of the request.
Users are advised to update the Contact Manager plugin to version 9.1.3 or a newer patched version.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Oct 28, 2026CISA-ADP
Assessed Oct 29, 2026References to Advisories, Solutions, and Tools
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Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-434 | Unrestricted Upload of File with Dangerous Type | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Contact Manager | <= 9.1.2 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Oct 29, 2026 | CVE Modified | CISA-ADP |
| Oct 28, 2026 | New CVE Received | [email protected] |