CVE-2026-86934 FileMaker Server - Authorization Bypass

FileMaker Server before 26.0.3 contains an authorization bypass caused by improper handling of extended privilege headers in the Web Publishing Engine, letting attackers access the XML Web Publishing interface despite disabled settings, exploit requires crafted requests with extended privilege headers.

CVSS base score 9.1 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.32% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Authorization Bypass
Impact
Broken Access Control
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Published
23 September 2026
Updated
15 October 2026
Weakness
CWE-639

Vendor fix

Update to version 26.0.3 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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