What’s Vulnerable › Vulnerabilities

CVE-2026-108109: PHPNuxBill through 2025.3.20 Account Takeover via Brute-Forceable Password Reset Code

• Severity: critical (CVSS 9.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-09 · updated 2026-10-09
• Weakness: CWE-307

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.

Affected products

• hotspotbilling phpnuxbill: through 2025.3.20

References

• https://github.com/hotspotbilling/phpnuxbill
• https://github.com/hotspotbilling/phpnuxbill/blob/2025.3.13/system/controllers/forgot.php#L41
• https://github.com/hotspotbilling/phpnuxbill/commit/c3c2a92d468af91136d747b75142ed72f10320cc
• https://github.com/hotspotbilling/phpnuxbill/security/advisories/GHSA-337r-rrrc-r559
• https://www.vulncheck.com/advisories/phpnuxbill-through-2025.3.20-account-takeover-via-brute-forceable-password-reset-code
• https://github.com/hotspotbilling/phpnuxbill/security/advisories/GHSA-337r-rrrc-r559

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