CVE-2026-108108

PHPNuxBill through 2025.3.20 CHAP Authentication Bypass via Password::chap_verify()

7.1 High

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.

Attack profile

How easy it is to exploit

Attack vector: Adjacent network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: Low
Integrity: High
Availability: None

Exploit likelihood

0.34%Up 0.1 points since Oct 10, 2026

What each source reports

CVE List Score used 7.1

PHPNuxBill through 2025.3.20 CHAP Authentication Bypass via Password::chap_verify()

Record: CVE-2026-108108
CVSS 4.0: 7.1 HighCVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N
CVSS 3.1: 7.1 HighCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N
Weakness: CWE-287
Updated: 2026-11-02

EUVDEUVD-2026-95809 7.1

Record: EUVD-2026-95809
CVSS 4.0: 7.1 HighCVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N
Updated: 2026-11-02

GitHub AdvisoriesGHSA-84mc-cxq8-4h6r 7.1

PHPNuxBill through 2025.3.20 contains an authentication bypass vulnerability in RADIUS CHAP...

Record: GHSA-84mc-cxq8-4h6r
CVSS 4.0: 7.1 HighCVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1: 7.1 HighCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N
Weakness: CWE-287
Updated: 2026-11-02

NVD 7.1

Record: CVE-2026-108108
CVSS 4.0: 7.1 HighCVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1: 7.1 HighCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N
Weakness: CWE-287
Updated: 2026-11-02

Affected products

hotspotbilling phpnuxbill

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-108108 is a high vulnerability (CVSS 7.1) in Hotspotbilling Phpnuxbill, published October 9, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.34%, the 27th percentile. No source names a fixed version.