CVE-2026-53523: Nezhahq Nezha

Medium severity, CVSS 6.8. EPSS: 0.3% chance of exploitation in the next 30 days.

Nezha Monitoring is a self-hostable, lightweight, servers and websites monitoring and O&M tool. From version 1.0.0 to before version 2.2.0, the getRedirectURL function in oauth2.go:22-29 constructs the OAuth2 callback URL by concatenating the request's Host header with a fixed path, with zero validation of the Host header. This can result in host header injection. This issue has been patched in version 2.2.0.

Affected products

• Nezhahq Nezha: from 1.0.0, before 2.2.0 (fixed in 2.2.0)

Published 2026-06-12. Last modified 2026-06-17.