CVE-2026-3666 is a path traversal vulnerability in the wpForo Forum WordPress plugin that allows authenticated users with subscriber-level permissions or higher to delete arbitrary files on the server. This occurs because the plugin fails to properly validate file names and paths against path traversal sequences when processing forum post deletions. The vulnerability affects all versions up to and including 2.4.16. The CVSS 3.1 base score is 8.8, reflecting network attack vector, low attack complexity, required privileges, no user interaction, and high impact on confidentiality, integrity, and availability. No patch or official remediation has been published by the vendor as of the publication date.

Successful exploitation allows an authenticated attacker with subscriber-level access or higher to delete arbitrary files on the server hosting the WordPress site. This can lead to loss of critical files, potential denial of service, and compromise of system integrity and confidentiality. The high CVSS score reflects the severity of these impacts. There are no reports of active exploitation in the wild currently.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, restrict subscriber-level user permissions where possible and monitor for suspicious activity related to forum post deletions. Avoid granting unnecessary privileges to users and consider disabling the wpForo Forum plugin if feasible.