What’s Vulnerable › Vulnerabilities

CVE-2026-25651: client-certificate-auth has an Open Redirect via Host Header Injection in HTTP-to-HTTPS redirect

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-02-06 · updated 2026-06-17
• Weakness: CWE-601

Description

client-certificate-auth is middleware for Node.js implementing client SSL certificate authentication/authorization. Versions 0.2.1 and 0.3.0 of client-certificate-auth contain an open redirect vulnerability. The middleware unconditionally redirects HTTP requests to HTTPS using the unvalidated Host header, allowing an attacker to redirect users to arbitrary domains. This vulnerability is fixed in 1.0.0.

Affected products

• tgies client-certificate-auth: from 0.2.1 before 1.0.0 — fixed in 1.0.0

How to fix

Upgrade to a fixed version: tgies client-certificate-auth 1.0.0. Check the vendor advisory for mitigations.

References

• https://github.com/tgies/client-certificate-auth/releases/tag/v1.0.0
• https://github.com/tgies/client-certificate-auth/security/advisories/GHSA-m4w9-gch5-c2g4

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