Nezha Monitoring: Authenticated users can claim the dashboard Host through NAT and preempt all dashboard routing

{
  "id": "d195ed7e32507664f0f2636d39ed357cd3c1f98f5c02e254d23b7c1d5e84b4cb",
  "url": "https://osv.dev/vulnerability/CVE-2026-53520",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Nezha Monitoring: Authenticated users can claim the dashboard Host through NAT and preempt all dashboard routing",
    "summary": "Nezha Monitoring is a self-hostable, lightweight, servers and websites monitoring and O&M tool. From version 2.0.14 to before version 2.1.0, authenticated users can claim the dashboard Host through NAT and preempt all dashboard routing. This issue has been patched in version 2.1.0.",
    "evidence": "osv:CVE-2026-53520",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-53520",
      "aliases": [
        "CVE-2026-53520",
        "GHSA-x6fg-52vr-hj4w",
        "GO-2026-5824"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/nezhahq/nezha",
              "type": "GIT",
              "events": [
                {
                  "introduced": "8b5e382fe217107c7b777ea9c6b4bc3d2e156202"
                },
                {
                  "fixed": "1d70d2992ec7ee5fac2e12ce15d0ea8005a589d4"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "2.0.14"
                      },
                      {
                        "fixed": "2.1.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "2.1.0"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53520.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:23.943449563Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53520.json",
        "https://github.com/nezhahq/nezha/security/advisories/GHSA-x6fg-52vr-hj4w",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-53520"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-284"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53520.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-53520",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 490619,
  "published_at": "2026-06-12T21:03:58.782+00:00"
}