Security advisory

{
  "id": "c6146b60c4027f35e82fe5798581e353500c87db9fe4bad6d0908d3fa103d222",
  "url": "https://osv.dev/vulnerability/CVE-2026-37503",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2026-37503",
    "summary": "Cross-Site Scripting (XSS) in V2Board thru 1.7.4. The custom_html field in theme configuration is rendered using Blade unescaped output in public/theme/v2board/dashboard.blade.php. An admin can inject arbitrary JavaScript via the saveThemeConfig API. All site visitors execute the payload, enabling cookie theft, session hijacking, or phishing.",
    "evidence": "osv:CVE-2026-37503",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-37503",
      "aliases": [
        "CVE-2026-37503"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AC:L/AV:N/A:N/C:H/I:L/PR:H/S:C/UI:R"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/v2board/v2board",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "0ca47622a50116d0ddd7ffb316b157afb57d25e8"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:v2board:v2board:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "1.7.4"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "1.7.4",
            "1.7.3",
            "1.7.2",
            "1.7.1",
            "1.7.0",
            "1.6.1",
            "1.6.0",
            "1.5.5",
            "1.5.4",
            "1.5.3",
            "1.5.2",
            "1.5.1",
            "1.5.0",
            "1.4.3",
            "1.4.2",
            "1.4.1",
            "1.4",
            "1.3.2",
            "1.3.1",
            "1.3",
            "1.2.5",
            "1.2.4",
            "1.2.3",
            "1.2.2",
            "1.2.1",
            "1.2",
            "1.1.2",
            "1.1.1",
            "1.1",
            "1.0.3",
            "1.0.2",
            "1.0.1",
            "1.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-37503.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:29.633833163Z",
      "provider": "osv",
      "references": [
        "https://gist.github.com/sgInnora/1330e1a82caa79906eec55eeff2c99b9",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/37xxx/CVE-2026-37503.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-37503",
        "https://github.com/v2board/v2board"
      ],
      "provider_metadata": {
        "cna_assigner": "mitre",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/37xxx/CVE-2026-37503.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-37503",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 496518,
  "published_at": "2026-05-01T00:00:00+00:00"
}