CVE-2026-53908— User Enumeration in MCO
Possible ATT&CK Techniques 1AI
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I. Basic Information for CVE-2026-53908
Vulnerability Information
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Vulnerability Title
User Enumeration in MCO
Source: NVD (National Vulnerability Database)
Vulnerability Description
MCO is vulnerable to User Enumeration through authentication-related functionalities. The application returns distinguishable responses for valid and invalid users during username reminder and password reset operations. An attacker can leverage these differences to enumerate valid usernames and email addresses. 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
响应差异性信息暴露
Source: NVD (National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| MyComplianceOffice | MCO | 25.3.3.1 | - |
II. Public POCs for CVE-2026-53908
| # | POC Description | Source Link | Shenlong Link |
|---|
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Security Blog Posts for CVE-2026-53908 (1)
- 🔗 Vulnerabilities in MyComplianceOffice MCO software | CERT Polskathird-party-advisory
Vendor Pages for CVE-2026-53908 (1)
Same Patch Batch · MyComplianceOffice · 2026-07-01 · 8 CVEs total
| CVE-2026-53902 | Privilege Escalation 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 | |
| CVE-2026-53909 | Arbitrary File Upload in MCO |
IV. Related Vulnerabilities
Same weakness: CWE-204
- CVE-2026-53947
Ghost: Member existence leak via magic link sign-in response - CVE-2026-54445
Vantage6: Set admin user and password from environment or co - CVE-2026-43926
FOSSBilling's password reset confirmation endpoint lacks rat - CVE-2026-45620
AVideo CVE-2026-43881 incomplete fix - `objects/mention.json - CVE-2018-25350
userSpice 4.3.24 Username Enumeration via existingUsernameCh
V. Comments for CVE-2026-53908
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