---
id: CVE-2026-108108
title: >-
  PHPNuxBill through 2025.3.20 contains an authentication bypass vulnerability
  in RADIUS CHAP verification because Password::chap_verify() returns true when
  the supplied response does not match
summary: >-
  PHPNuxBill through 2025.3.20 contains an authentication bypass vulnerability
  in RADIUS CHAP verification because Password::chap_verify() returns true when
  the supplied response does not match. Attackers who know a valid customer or
  PPPoE…
severity: high
cvss: 7.1
cvssVector: 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N'
cwe:
  - CWE-287
published: '2026-10-09'
updated: '2026-10-09'
sourceUpdated: '2026-10-09T16:45:01.980'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-108108'
references:
  - url: 'https://github.com/hotspotbilling/phpnuxbill'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/hotspotbilling/phpnuxbill/blob/2025.3.13/system/autoload/Password.php#L48
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/hotspotbilling/phpnuxbill/security/advisories/GHSA-6f62-x25v-9686
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/phpnuxbill-through-2025.3.20-chap-authentication-bypass-via-password-chap-verify
    label: disclosure@vulncheck.com
tags:
  - nvd
ingestedAt: '2026-10-09T16:02:33.385Z'
---

## Overview

PHPNuxBill through 2025.3.20 contains an authentication bypass vulnerability in RADIUS CHAP verification because Password::chap_verify() returns true when the supplied response does not match. Attackers who know a valid customer or PPPoE username can log in through MikroTik hotspot or PPPoE CHAP with any incorrect password to obtain network access and consume that customer's plan.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.