CVE-2026-86934: Claris Filemaker Server

Critical severity, CVSS 9.1. EPSS: 0.3% chance of exploitation in the next 30 days.

An authorization bypass vulnerability in the FileMaker Server Web Publishing Engine allowed requests containing an extended privilege header to bypass the disabled Custom Web Publishing with XML setting and access the XML Web Publishing interface. This vulnerability is addressed in FileMaker Server version 26.0.3.

Affected products

• Claris Filemaker Server: before 26.0.3 (fixed in 26.0.3)

Published 2026-09-23. Last modified 2026-10-05.