Vulnerability in Hotspotbilling Phpnuxbill
CVE-2026-108109
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/hotspotbilling/phpnuxbill/security/advisories/GHSA-337r-rrrc-r559 (vendor-advisory)
- github.com/hotspotbilling/phpnuxbill/commit/c3c2a92d468af91136d747b75142ed72f10… (patch)
- github.com/hotspotbilling/phpnuxbill/blob/2025.3.13/system/controllers/forgot.p… (technical-description)
- github.com/hotspotbilling/phpnuxbill (product)
- www.vulncheck.com/advisories/phpnuxbill-through-2025.3.20-account-takeover-via-… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-108109?
- CVE-2026-108109 is a critical-severity vulnerability in Hotspotbilling Phpnuxbill, classified under Improper Restriction of Excessive Authentication Attempts. CVSS score: 9.1/10. Published 2026-10-09.
- How severe is CVE-2026-108109?
- Critical severity. CVSS v3 base score is 9.1 out of 10.