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Advisories

PHPNuxBill through 2025.3.20 Account Takeover via Brute-Forceable Password Reset Code

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severity
critical
date
Affecting

  • phpnuxbill <= 2025.3.20

CWE
  • CWE-307 Improper Restriction of Excessive Authentication Attempts
CVSS
9.3
CVSS V4 Vector
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
Credit
tonghuaroot, leediay153 from Viettel Post
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.

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