CVE-2026-86930 FileMaker Server - Out of Bounds Read

FileMaker Server for Linux contains an out-of-bounds read vulnerability caused by processing specially crafted image files in container fields during thumbnail generation in FileMaker WebDirect, letting attackers disclose process memory, exploit requires uploading a crafted image file.

CVSS base score 9.1 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.29% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Out of Bounds Read
Impact
Information Disclosure
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Published
23 September 2026
Updated
15 October 2026
Weakness
CWE-125

Vendor fix

Update to FileMaker Server 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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