CVE-2026-101090 Nezha - Host Header Injection

Nezha 2.2.3 contains a host header injection caused by reflecting attacker-supplied HTTP Host header in OAuth2 redirect_uri when dashboard_host is empty, letting attackers hijack OAuth2 login flow, exploit requires empty dashboard_host configuration.

CVSS base score 9.8 /10
Critical
CISA KEV
Not listed
Public exploit
None known
EPSS
0.36% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Host Header Injection
Impact
Broken Authentication
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
27 September 2026
Updated
15 October 2026
Weakness
CWE-601

Vendor fix

Configure dashboard_host to a non-empty value or update to a patched version when available.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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