CVE-2026-108108

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 4.0

7.1CVSS: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

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

EPSS

0.3% chance of exploitation in the next 30 days; higher than 27% of CVEs (scores of 2026-10-25)

CWE

CWE-287

Published

2026-10-09

Modified

2026-10-14

Record from

the NVD, synced 2026-10-19

References

• https://github.com/hotspotbilling/phpnuxbill
• https://github.com/hotspotbilling/phpnuxbill/blob/2025.3.13/system/autoload/Password.php#L48
• https://github.com/hotspotbilling/phpnuxbill/security/advisories/GHSA-6f62-x25v-9686
• https://www.vulncheck.com/advisories/phpnuxbill-through-2025.3.20-chap-authentication-bypass-via-password-chap-verify
• https://github.com/hotspotbilling/phpnuxbill/security/advisories/GHSA-6f62-x25v-9686

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