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CVE-2026-108108

7.1 · HIGH

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.

Published Oct 9, 2026CWE-287EPSS 0.34%

Overview

CVE-2026-108108 is a high-severity vulnerability. It was published on October 9, 2026 and has a CVSS 3.1 base score of 7.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.1, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical description

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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/hotspotbilling/phpnuxbillGitHubgithub.com/hotspotbilling/phpnuxbill/blob/2025.3.13/system/autoload/Password.php#L48GitHubgithub.com/hotspotbilling/phpnuxbill/security/advisories/GHSA-6f62-x25v-9686Refwww.vulncheck.com/advisories/phpnuxbill-through-2025.3.20-chap-authentication-bypass-via-password-chap-verifyGitHubgithub.com/hotspotbilling/phpnuxbill/security/advisories/GHSA-6f62-x25v-9686

How CyberStrike helps

Frequently asked questions

What is CVE-2026-108108?

CVE-2026-108108 is a high-severity vulnerability. It was published on October 9, 2026 and has a CVSS 3.1 base score of 7.1 (HIGH).

How severe is CVE-2026-108108?

This vulnerability has a CVSS 3.1 base score of 7.1, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-108108?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-108108?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-108108 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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