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CVE-2026-109218

9.8 critical Deferred
NVD · CVE.org

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.

Fix

Nothing published yet: no patch, vendor advisory or mitigation reference on NVD, no vendor advisory in the News for this CVE, not in CISA's KEV, no fixed package version. BaselineWatch does not guess at one.

Change history 4

  1. StatusPublished → DeferredNVD modified 2026-10-28 13:46
  2. StatusReceived → PublishedNVD modified 2026-10-28 06:45
  3. StatusPublished → ReceivedNVD modified 2026-10-28 07:16
  4. First seenCVSS 9.8 · kleorNVD modified 2026-10-28 06:45

Affected (CPE criteria) 0

NVD has not attached CPE configurations yet.

References 7