CVE-2026-101090 (GCVE-0-2026-101090)
Vulnerability from cvelistv5 – Published: 2026-09-27 20:50 – Updated: 2026-09-28 13:00
VLAI
EPSS
VEX
Title
Nezha through 2.2.3 Host Header Injection via OAuth2 redirect_uri
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.
Severity
9.8 (Critical)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-28 12:59 UTC
CWE
- CWE-601 - URL Redirection to Untrusted Site ('Open Redirect')
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/nezhahq/nezha/security/advisor… | vendor-advisory |
| https://www.vulncheck.com/advisories/nezha-throug… | third-party-advisory |
Impacted products
Date Public
2026-06-20 00:00
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