XSS in Unified Search via Unescaped Host/Service Names

{
  "id": "ceba9b30b378fa6f9e0a37a8c8c0db9a794e7139ca8fb85542a60eb49b0e7234",
  "url": "https://osv.dev/vulnerability/CVE-2026-33276",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "XSS in Unified Search via Unescaped Host/Service Names",
    "summary": "Stored cross-site scripting (XSS) in Checkmk 2.5.0 (beta) before 2.5.0b2 allows authenticated users with permission to create hosts or services to execute arbitrary JavaScript in the browsers of other users performing searches in the Unified Search feature.",
    "evidence": "osv:CVE-2026-33276",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-33276",
      "aliases": [
        "CVE-2026-33276"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:H/SC:N/SI:L/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/checkmk/checkmk",
              "type": "GIT",
              "events": [
                {
                  "introduced": "406aa5e6e4301396e7db0a7a763e8db1de64635e"
                },
                {
                  "last_affected": "406aa5e6e4301396e7db0a7a763e8db1de64635e"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:checkmk:checkmk:2.5.0:b1:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "2.5.0-b1"
                      },
                      {
                        "last_affected": "2.5.0-b1"
                      }
                    ],
                    "source": "CPE_STRING"
                  }
                ]
              }
            }
          ],
          "versions": [
            "2.5.0-b1",
            "v2.5.0p1-rc2",
            "v2.5.0p1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-33276.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:42.081159639Z",
      "provider": "osv",
      "references": [
        "https://checkmk.com/werk/19525",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33276.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-33276"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-79"
        ],
        "cna_assigner": "Checkmk",
        "unresolved_ranges": [
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "2.5.0b1"
                  },
                  {
                    "fixed": "2.5.0b2"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StandardRange"
              }
            ]
          }
        ],
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33276.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-33276",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 510040,
  "published_at": "2026-03-31T13:44:17.857+00:00"
}