CVE-2026-108109 PHPNuxBill through 2025.3.20 Account Takeover via Brute-Forceable Password Reset Code
Unauthenticated attackers can hijack customer accounts by brute-forcing the 6-digit password reset code due to missing rate limits.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-108109?
CVE-2026-108109 is a critical authentication bypass vulnerability in hotspotbilling phpnuxbill, published on 9 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
PHPNuxBill through 2025.3.20 contains an account takeover vulnerability in the customer password reset flow in system/controllers/forgot.php that allows unauthenticated attackers to brute-force the 6-digit otp_code. Attackers knowing a customer username can guess the code without attempt limits or lockout, then read the newly set password from the HTTP response to hijack the account.
Weakness: CWE-307
Which versions are affected by CVE-2026-108109?
How do I fix CVE-2026-108109?
No fix has been published for CVE-2026-108109 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-2026-108109 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-108109 exists.
Sources
Also known as GHSA-337r-rrrc-r559, GHSA-mph9-7w43-p247.