Vulnerability · Published Oct 9, 2026 · Assigned by VulnCheck

CVE-2026-108108PHPNuxBill through 2025.3.20 CHAP Authentication Bypass via Password::chap_verify()

High 7.1

In plain English

A high-severity improper authentication in phpnuxbill from hotspotbilling. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 28% of all known vulnerabilities).

Severity (CVSS 3.1)7.1High

Exploit odds (30 days)0.3%top 72.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

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.

Affected products (as reported)

Vendor	Product	Versions
hotspotbilling	phpnuxbill	0 – through 2025.3.20

Weakness: CWE-287 · Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N

References

GitHub Security Advisory (GHSA-6f62-x25v-9686) vendor-advisory
https://github.com/hotspotbilling/phpnuxbill/blob/2025.3.13/system/autoload/Password.php#L48 technical-description
https://github.com/hotspotbilling/phpnuxbill product
VulnCheck Advisory: PHPNuxBill through 2025.3.20 CHAP Authentication Bypass via Password::chap_verify() third-party-advisory