---
title: "CVE-2026-101090: Nezha - Host Header Injection"
description: "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."
url: https://panop.io/threat-heartbeat/CVE-2026-101090/
---

# 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 ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-101090)

## 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](https://cwe.mitre.org/data/definitions/601.html)

## 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

- [https://nvd.nist.gov/vuln/detail/CVE-2026-101090](https://nvd.nist.gov/vuln/detail/CVE-2026-101090)
- [https://www.vulncheck.com/advisories/nezha-through-2.2.3-host-header-injection-via-oauth2-redirect-uri](https://www.vulncheck.com/advisories/nezha-through-2.2.3-host-header-injection-via-oauth2-redirect-uri)
- [https://github.com/nezhahq/nezha/security/advisories/GHSA-rf68-8gjr-36q7](https://github.com/nezhahq/nezha/security/advisories/GHSA-rf68-8gjr-36q7)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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