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CVE PROGRAM SOURCE RECORD5.3 Medium

CVE-2026-53909

Arbitrary File Upload in MCO

Description

MCO does not correctly validate types of uploaded files. File upload validation functionality relies only on client-side checks, which can be bypassed. An authorized, low-privileged attacker can upload files with arbitrary types to the server. Because vendor contact attempts were unsuccessful, the vulnerability has only been confirmed in version 25.3.3.1 but may also affect other versions.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

MyComplianceOffice MCO

Default version status: unknown

  • 25.3.3.1affected

References