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CVE-2026-101090: nezha

Severity

9.3 (CRITICAL)

Vendor

NEZHA

Affected versions

2.2.3 through 2.2.3

Patch status

Unpatched

Published

2026-09-27T21:17:03.003

Modified

2026-09-28T13:17:21.117

Why it matters

This matters because the issue affects identity or token handling. Successful exploitation could allow unauthorized authentication, client manipulation, or access to protected services.

Recommended admin actions

• Prioritize validation immediately due to critical CVSS severity.
• Apply compensating controls or temporarily remove exposure until a vendor fix is available.

Technical summary

Nezha 2.2.3 contains a Host header injection regression in the OAuth2 redirect endpoint. When the new optional dashboard_host setting is empty, /api/v1/oauth2/{provider} (cmd/dashboard/controller/oauth2.go) reflects the attacker-supplied HTTP Host header into the redirect_uri sent to the identity provider instead of falling back to the configured install_host. An attacker who induces a victim to begin OAuth2 login via a request that reaches Nezha with a forged Host header can cause an attacker-controlled callback URL to be used as the redirect_uri; if the OAuth2 provider accepts it, the victim's authorization code is delivered to the attacker origin, allowing the attacker to complete the OAuth2 login/binding flow and take over the account. This regresses the fix for GHSA-9rc6-8cjv-rcvx and is configuration-dependent (dashboard_host empty). At the time of the advisory no patched version was available.

View the official NVD record for CVE-2026-101090

CVE data is sourced from NVD/CNA records and optional enrichment. Validate against the vendor advisory before taking production action.