CVE-2026-53909— Arbitrary File Upload in MCO
Possible ATT&CK Techniques 1AI
T1505.003 · Web ShellAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| MyComplianceOffice | MCO | 25.3.3.1 | affected |
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I. Basic Information for CVE-2026-53909
Vulnerability Information
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Vulnerability Title
Arbitrary File Upload in MCO
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
危险类型文件的不加限制上传
Source: NVD (National Vulnerability Database)
Vulnerability Title
MyComplianceOffice MCO 任意文件上传漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MyComplianceOffice MCO是MyComplianceOffice公司的一款合规与风险管理软件。 MyComplianceOffice MCO 25.3.3.1版本存在任意文件上传漏洞，该漏洞源于未正确验证上传文件类型，且文件上传验证功能仅依赖客户端检查，可被绕过，导致授权后的低权限攻击者可将任意类型文件上传至服务器。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| MyComplianceOffice | MCO | 25.3.3.1 | - |
II. Public POCs for CVE-2026-53909
| # | POC Description | Source Link | Shenlong Link |
|---|
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Security Blog Posts for CVE-2026-53909 (1)
- 🔗 Vulnerabilities in MyComplianceOffice MCO software | CERT Polskathird-party-advisory
Vendor Pages for CVE-2026-53909 (1)
Same Patch Batch · MyComplianceOffice · 2026-07-01 · 8 CVEs total
| CVE-2026-53902 | Privilege Escalation in MCO | |
| CVE-2026-53908 | User Enumeration in MCO | |
| CVE-2026-53903 | Insecure Direct Object Reference in MCO | |
| CVE-2026-53907 | Stored Cross‑Site Scripting in MCO | |
| CVE-2026-53906 | Path Disclosure and Path Traversal in MCO | |
| CVE-2026-53904 | Account Denial of Service in MCO | |
| CVE-2026-53905 | Unauthorized Access to Administrator ACL View in MCO |
IV. Related Vulnerabilities
Same weakness: CWE-434
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V. Comments for CVE-2026-53909
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