CVE-2026-86934

Critical

Description

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.

SeverityCritical

CVSS9.1

Exploit probability—

ProductClaris Filemaker Server

PublishedSep 23, 2026

First seenSep 23, 2026

Weakness typeCWE-639Authorization bypass through user-controlled key

How to fix

Update

claris filemaker_server26.0.3 or later

Affected products

Product	Affected versions	Fixed in
claris filemaker_server	v < 26.0.3	26.0.3

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