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TI-2026-59420 Aliases CVE-2026-86926GHSA-9vrp-wjh8-mfg5

Heap-based buffer overflow in Claris FileMaker Server

Priority LOW 35CWE-122Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-122 and the CVSS impact.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00128 2nd percentileScored 2026-11-07
Fix Fixed FileMaker Server (Claris): 26.0.3

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
ClarisFileMaker Serverbefore 26.0.326.0.3Patch availableCNA
  • FileMaker Server VendorClaris Affected before 26.0.3 Fixed in 26.0.3 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:claris:filemaker_server:*:*:*:*:*:*:*:*before 26.0.3VulnerableClaris
  • cpe:2.3:a:claris:filemaker_server:*:*:*:*:*:*:*:* Versions before 26.0.3 Vulnerable ·Claris

Remediation

  • Fix · CNA FileMaker Server (Claris) Fixed in 26.0.3

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    Claris FileMaker Server 26.0.3

    3 records Highest priority Priority MEDIUM 2 MEDIUM, 1 LOW

    Other records, highest priority first

    • TI-2026-59422 Authorization bypass in Claris FileMaker ServerPriority MEDIUM 47
    • TI-2026-59421 Out-of-bounds read in Claris FileMaker ServerPriority MEDIUM 47
    Show all 3 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-86926
  2. 2026-10-03 Alias added: GHSA-9vrp-wjh8-mfg5

References

Advisory 1

  • TI-2025-29047 Code injection in Claris FileMaker Server CVSS 3.1CRITICAL 9.8
  • TI-2026-59422 Authorization bypass in Claris FileMaker Server CVSS 3.1CRITICAL 9.1
  • TI-2026-59421 Out-of-bounds read in Claris FileMaker Server CVSS 3.1CRITICAL 9.1
  • TI-2024-18405 Improper access control in Claris FileMaker Server CVSS 3.1HIGH 7.5
  • TI-2023-23030 A privilege escalation issue existed in FileMaker Server, potentially exposing sensitive… CVSS 3.1MEDIUM 6.5
  • TI-2025-29046 Information disclosure in Claris FileMaker Server CVSS 3.1MEDIUM 5.3
See all 12 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences