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How the CVE Works
The vulnerability exists in Komari’s 2FA verification logic within api/login.go. The function `Verify2FA()` contains a flawed condition that incorrectly validates 2FA codes. Due to a logical error, the function cannot return both an error state and a true validation simultaneously. This flaw causes the system to accept any 6-digit code as valid, effectively bypassing the 2FA protection mechanism. The issue stems from improper boolean checks in the authentication flow, where failed verification attempts are not properly handled. Attackers can exploit this by submitting arbitrary 6-digit codes during login to gain unauthorized access.
DailyCVE Form
Platform: Komari
Version: < 0.0.0-20250809064056
Vulnerability: 2FA Bypass
Severity: Critical
Date: Aug 12, 2025
Prediction: Patch by Aug 19, 2025
What Undercode Say
// Vulnerable code snippet from login.go
if Verify2FA(user, inputCode) || !Verify2FA(user, inputCode) {
grantAccess()
}
curl -X POST https://target/login -d 'user=admin&code=123456'
How Exploit
1. Intercept login request
2. Insert any 6-digit code
3. Gain unauthorized access
Protection from this CVE
Update to version 0.0.0-20250809064056
Implement proper 2FA validation checks
Add fail-closed logic
Impact
Full 2FA bypass
Unauthorized account access
Elevated privileges possible
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Sources:
Reported By: github.com
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