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TI-2026-70066 Aliases CVE-2026-108108

PHPNuxBill CHAP authentication bypass accepts wrong passwords

Priority MEDIUM 64CWE-287Published · Updated

Key facts

Attack vector
Adjacent network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Security bypass
Confidentiality · integrity · availability
Low · High · None
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-287.

Summary

PHPNuxBill through 2025.3.20 contains an authentication bypass in RADIUS CHAP verification (CWE-287). Password::chap_verify() returns true when the supplied response does not match, so wrong responses are accepted. An attacker on an adjacent network who knows a valid customer or PPPoE username can log in through MikroTik hotspot or PPPoE CHAP with any incorrect password, gaining network access and using that customer's plan. CISA's SSVC data rates exploitation as proof of concept.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00341 27th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
hotspotbillingphpnuxbillup to 2025.3.20—No fix listedCNA
  • phpnuxbill Vendorhotspotbilling Affected up to 2025.3.20 Fixed in — No fix listed CNA

Remediation

The sources list no fixed version for PHPNuxBill.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Timeline

  1. 2026-10-09 Threatist record created from CVE-2026-108108
  2. 2026-10-11 Priority changed: MEDIUM → LOW
  3. 2026-10-14 CISA SSVC decision points changed
  4. 2026-10-14 Priority changed: LOW → MEDIUM

References

Advisory 1

Other 2

  • TI-2026-70067 Account takeover in PHPNuxBill via brute-forceable reset code CVSS 4.0CRITICAL 9.3
  • TI-2026-70065 PHPNuxBill unauthenticated SQL injection via radius.php REST endpoint CVSS 4.0CRITICAL 9.3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences