CVE-2026-108108 PUBLISHED

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

Assigner: VulnCheck
Reserved: 09.10.2026 Published: 09.10.2026 Updated: 09.10.2026

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.

CVSS Vector: CVSS: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 Score: 7.1

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Adjacent	Confidentiality	Low	Confidentiality	None
Attack Complexity	Low	Integrity	High	Integrity	None
Attack Requirements	None	Availability	None	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

CVSS Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N
CVSS Score: 7.1

Attack Vector	Adjacent Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	Low
Privileges Required	None	Integrity Impact	High
User Interaction	None	Availability Impact	None

CVSS 3.1

Product Status

Vendor	hotspotbilling
Product	phpnuxbill
Versions	Default: unaffected affected from 0 to 2025.3.20 (incl.)

CVE-2026-108108 PUBLISHED

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

Metrics

Product Status

Credits

References

Problem Types