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NVD CRITICAL: CVE-2026-109218 — The Contact Manager plugin for WordPress is vulnerable to Arbitrary File Upload ...

·Source: NIST NVD

Updated:

Executive Summary

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

Analysis

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. CVSS Score: 9.8. Published: 2026-10-28T07:16:44.120.

Indicators of Compromise (1)

CVE (1)
CVE-2026-109218
NVDMITRE CVE
Source Attribution

Originally published by NIST NVD on Oct 28, 2026. Verified by: NIST.

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