by Kastro
Paper/Archive/CVE-2026-108109

CVE-2026-108109

hotspotbilling phpnuxbill — PHPNuxBill through 2025.3.20 Account Takeover via Brute-Forceable Password Reset Code

EPSS 0.4%public exploitCVSS 9.3
critical.is priorityof 100
45
CVSS 9.3 (CNA)9.3 / 10 × 3027.9Not in CISA KEV+300.0EPSS percentile 32.8.328 × 206.6Exploit: SSVC poc+1010.0SSVC exploitation: poc+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
phpnuxbill≤ 2025.3.20–CNA

Scores by source

VulnCheck (CNA)9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
VulnCheck (CNA)9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CISA ADPSSVCExploitation: poc · Automatable: yes · Technical impact: total

References

exploitgithub.com/hotspotbilling/phpnuxbill/security/advisories/GHSA-337r-rrrc-r559patchgithub.com/hotspotbilling/phpnuxbill/commit/c3c2a92d468af91136d747b75142ed72f10320ccwriteupgithub.com/hotspotbilling/phpnuxbill/blob/2025.3.13/system/controllers/forgot.php#L41refgithub.com/hotspotbilling/phpnuxbillwriteupvulncheck.com/advisories/phpnuxbill-through-2025.3.20-account-takeover-via-brute-forceable-password-reset-code