CVE-2026-108109 PHPNuxBill - Authentication Bypass

PHPNuxBill through 2025.3.20 contains an account takeover vulnerability caused by lack of attempt limits on 6-digit otp_code in customer password reset flow in system/controllers/forgot.php, letting unauthenticated attackers hijack accounts by brute-forcing OTP and reading new password from HTTP response, exploit requires knowing a customer username.

CVSS base score 9.1 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.39% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Authentication Bypass
Impact
Broken Authentication
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Published
9 October 2026
Updated
15 October 2026
Weakness
CWE-307

Vendor fix

Update to the latest version beyond 2025.3.20.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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