CVE-2026-108108 PHPNuxBill through 2025.3.20 CHAP Authentication Bypass via Password::chap_verify()
Attackers can bypass CHAP authentication in PHPNuxBill to access customer accounts and consume their network plans using any incorrect password.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-108108?
CVE-2026-108108 is a high-severity authentication bypass vulnerability in hotspotbilling phpnuxbill, published on 9 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim.
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.
Weakness: CWE-287
Which versions are affected by CVE-2026-108108?
How do I fix CVE-2026-108108?
No fix has been published for CVE-2026-108108 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-108108 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-108108 exists.
Sources
Also known as GHSA-84mc-cxq8-4h6r.