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CVE-2026-86926

HIGH
7.8
CVSS Score
Published: September 23, 2026 at 05:20 PM UTC
Updated: October 6, 2026 at 01:09 PM UTC
1 product affected across 1 vendorFileMaker Server

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Severity
HIGH7.8
Exploit prediction
EPSS 0.1%
SSVC
No known exploit

Description

A heap buffer overflow vulnerability in the FileMaker Server database engine block parsing routine allowed a maliciously crafted .fmp12 database file to cause memory corruption, potentially leading to arbitrary code execution. This vulnerability is addressed in FileMaker Server version 26.0.3.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

FileMaker Server· Claris
95%
v < 26.0.3
Affected range stops below 26.0.3, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor Advisory
Source: cverecord
https://support.claris.com/s/answerview?anum=000049219&language=en_US

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.8HIGHCISA-ADP
Attack Vector
LOCAL
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-122

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