CVE-2026-101090
published 2026-09-27CVE-2026-101090: Nezha 2.2.3 contains a Host header injection regression in the OAuth2 redirect endpoint. When the new optional dashboard_host setting is empty…
PriorityP261critical9.8CVSS 3.1
AVNACLPRNUINSUCHIHAH
EPSS
0.36%
27.3th percentile
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.
Affected
1 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| nezhahq | nezha | 2.2.3 – 2.2.3 | — |
CVSS provenance
nvdv3.19.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
nvdv4.09.3CRITICALCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
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GHSA
Nezha 2.2.3 contains a Host header injection regression in the OAuth2 redirect endpoint.
ghsa_unreviewed·2026-09-27
CVE-2026-101090 [CRITICAL] CWE-601 Nezha 2.2.3 contains a Host header injection regression in the OAuth2 redirect endpoint.
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
VulDB
nezhahq Nezha up to 2.2.3 OAuth2 Redirect Endpoint oauth2.go dashboard_host redirect (EUVD-2026-88025)
vuldb·2026-09-27·CVSS 9.8
CVE-2026-101090 [CRITICAL] nezhahq Nezha up to 2.2.3 OAuth2 Redirect Endpoint oauth2.go dashboard_host redirect (EUVD-2026-88025)
A vulnerability labeled as problematic has been found in nezhahq Nezha up to 2.2.3. The affected element is an unknown function of the file cmd/dashboard/controller/oauth2.go of the component OAuth2 Redirect Endpoint. Such manipulation of the argument dashboard_host leads to open redirect.
This vulnerability is documented as CVE-2026-101090. The attack can be executed remotely. There is not any exploit available.
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
2026-09-27
Published