CVE-2026-108109
PHPNuxBill through 2025.3.20 Account Takeover via Brute-Forceable Password Reset Code
- State
- Published
- Severity
- 9.3 Critical
- Published
- Oct 9, 2026
- Updated
- Oct 9, 2026
- Reserved
- Oct 9, 2026
Description
PHPNuxBill through 2025.3.20 contains an account takeover vulnerability in the customer password reset flow in system/controllers/forgot.php that allows unauthenticated attackers to brute-force the 6-digit otp_code. Attackers knowing a customer username can guess the code without attempt limits or lockout, then read the newly set password from the HTTP response to hijack the account.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 9.3 Critical | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 9.1 Critical | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N | VulnCheck |
Weaknesses
- CWE-307 Improper Restriction of Excessive Authentication Attempts
Affected Products
| Product | Versions |
|---|---|
phpnuxbillhotspotbilling |
|
References
- GitHub Security Advisory (GHSA-337r-rrrc-r559)vendor-advisory
- Patch Commitpatch
- https://github.com/hotspotbilling/phpnuxbill/blob/2025.3.13/system/controllers/forgot.php#L41technical-description
- https://github.com/hotspotbilling/phpnuxbillproduct
- VulnCheck Advisory: PHPNuxBill through 2025.3.20 Account Takeover via Brute-Forceable Password Reset Codethird-party-advisory
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