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.
Metrics
Affected Vendors & Products
References
History
Mon, 06 Jul 2026 23:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Mycomplianceoffice
Mycomplianceoffice mco |
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| Vendors & Products |
Mycomplianceoffice
Mycomplianceoffice mco |
Fri, 03 Jul 2026 14:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
|
Wed, 01 Jul 2026 12:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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. | |
| Title | Arbitrary File Upload in MCO | |
| Weaknesses | CWE-434 | |
| References |
| |
| Metrics |
cvssV4_0
|
Status: PUBLISHED
Assigner: CERT-PL
Published: 2026-07-01T11:59:26.104Z
Updated: 2026-07-01T13:37:13.787Z
Reserved: 2026-06-11T07:44:52.179Z
Link: CVE-2026-53909
Updated: 2026-07-01T13:37:10.268Z
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