CVE-2026-53523

Nezha Monitoring: OAuth2 Redirect URL — Host Header Injection

State: Published
Severity: 6.8 Medium
Published: Jun 12, 2026
Updated: Jun 15, 2026
Reserved: Jun 9, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	6.8 Medium	CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N	GitHub_M

Weaknesses

CWE-601 URL Redirection to Untrusted Site ('Open Redirect')

Affected Products

Product	Versions
nezhanezhahq	>= 1.0.0, < 2.2.0Affected

References

https://github.com/nezhahq/nezha/security/advisories/GHSA-9rc6-8cjv-rcvx

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