Nezha through 2.2.3 Host Header Injection via OAuth2 redirect_uri

{
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "cveMetadata": {
    "cveId": "CVE-2026-101090",
    "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
    "assignerShortName": "VulnCheck",
    "dateUpdated": "2026-09-27T20:50:00.857Z",
    "dateReserved": "2026-09-27T20:29:07.433Z",
    "datePublished": "2026-09-27T20:50:00.857Z",
    "state": "PUBLISHED"
  },
  "containers": {
    "cna": {
      "providerMetadata": {
        "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "shortName": "VulnCheck",
        "dateUpdated": "2026-09-27T20:50:00.857Z"
      },
      "datePublic": "2026-06-20T00:00:00.000Z",
      "title": "Nezha through 2.2.3 Host Header Injection via OAuth2 redirect_uri",
      "descriptions": [
        {
          "lang": "en",
          "value": "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": [
        {
          "vendor": "nezhahq",
          "product": "nezha",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "2.2.3",
              "status": "affected",
              "versionType": "semver",
              "lessThanOrEqual": "2.2.3"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "lang": "en",
              "description": "URL Redirection to Untrusted Site ('Open Redirect')",
              "cweId": "CWE-601",
              "type": "CWE"
            }
          ]
        }
      ],
      "references": [
        {
          "url": "https://github.com/nezhahq/nezha/security/advisories/GHSA-rf68-8gjr-36q7",
          "name": "GitHub Security Advisory (GHSA-rf68-8gjr-36q7)",
          "tags": [
            "vendor-advisory"
          ]
        },
        {
          "url": "https://www.vulncheck.com/advisories/nezha-through-2.2.3-host-header-injection-via-oauth2-redirect-uri",
          "name": "VulnCheck Advisory: Nezha through 2.2.3 Host Header Injection via OAuth2 redirect_uri",
          "tags": [
            "third-party-advisory"
          ]
        }
      ],
      "metrics": [
        {
          "format": "CVSS"
        },
        {
          "format": "CVSS",
          "cvssV3_1": {
            "version": "3.1",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "attackVector": "NETWORK",
            "attackComplexity": "LOW",
            "privilegesRequired": "NONE",
            "userInteraction": "NONE",
            "scope": "UNCHANGED",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "availabilityImpact": "HIGH",
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL"
          }
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "DavidCarliez",
          "type": "reporter"
        }
      ]
    }
  }
}