CVE-2026-108108
HIGH 7.1PHPNuxBill 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.
Severe if exploited (CVSS 7.1), but no known exploitation and low modeled probability. Patch on a normal cadence.
Exploitation likelihood
0.3%chance of exploitation in 30 days · 27th percentile
Impact if exploited
7.1CVSS 4.0 · HIGH
- ConfidentialityLow
- IntegrityHigh
- AvailabilityNone
What an attacker needs
- ⚠Access: Must sit on the same / adjacent network
- ✓Privileges: No account or privileges required
- ✓User interaction: No user interaction needed
- ✓Complexity: No special conditions — reliably repeatable
- ✓Requirements: No special attack requirements
✓ lowers the bar for an attacker · ⚠ raises it
Proof of concept
No public PoC is currently catalogued.
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Data snapshot:
Weakness (CWE)
- CWE-287: Improper Authentication
CVSS vector
CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N
References and research data (JSON)
All CVSS metrics
- HIGH 7.1 v4.0 · CNA Primary
CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N - HIGH 7.1 v3.1 · CNA Primary
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N - HIGH 7.1 v4.0 · NVD Secondary
CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - HIGH 7.1 v3.1 · NVD Secondary
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N
References
Exploit-tagged references (not proof of a PoC)
- https://github.com/hotspotbilling/phpnuxbill/security/advisories/GHSA-6f62-x25v-9686 CVE record · VulnCheck · Updated 2026-10-09T14:33:31.585Z
CVE record · CISA-ADP · Updated 2026-10-14T01:51:06.748Z
NVD · CVE-2026-108108 · Updated 2026-10-14T02:16:59.337
Advisories
- https://www.vulncheck.com/advisories/phpnuxbill-through-2025.3.20-chap-authentication-bypass-via-password-chap-verify CVE record · VulnCheck · Updated 2026-10-09T14:33:31.585Z
NVD · CVE-2026-108108 · Updated 2026-10-14T02:16:59.337 - https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-95809 EUVD · EUVD-2026-95809
Technical & other
- https://github.com/hotspotbilling/phpnuxbill/blob/2025.3.13/system/autoload/Password.php#L48 CVE record · VulnCheck · Updated 2026-10-09T14:33:31.585Z
NVD · CVE-2026-108108 · Updated 2026-10-14T02:16:59.337 - https://github.com/hotspotbilling/phpnuxbill CVE record · VulnCheck · Updated 2026-10-09T14:33:31.585Z
NVD · CVE-2026-108108 · Updated 2026-10-14T02:16:59.337