Security advisory

{
  "id": "cb92965dfa55625521c813d6285ce20133723a8540422ab4ca8141ad6d426f21",
  "url": "https://osv.dev/vulnerability/CVE-2021-31930",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-31930",
    "summary": "Persistent cross-site scripting (XSS) in the web interface of Concerto through 2.3.6 allows an unauthenticated remote attacker to introduce arbitrary JavaScript by injecting an XSS payload into the First Name or Last Name parameter upon registration. When a privileged user attempts to delete the account, the XSS payload will be executed.",
    "evidence": "osv:CVE-2021-31930",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2021-31930",
      "aliases": [
        "CVE-2021-31930"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/concerto/concerto",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "a9a513f9ec0949bf5b7ece2954719739dc71dc6d"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:concerto-signage:concerto:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "2.3.6"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "2.3.6",
            "2.3.5",
            "2.3.4",
            "2.3.3",
            "2.3.2",
            "2.3.0",
            "2.2.7",
            "2.2.4",
            "2.2.3",
            "2.2.2",
            "2.2.1",
            "2.2",
            "2.1.1",
            "2.1.0",
            "0.9.2.kilobalrog",
            "0.9.0.kilobalrog",
            "0.8.7.julietjaguar",
            "0.8.6.julietjaguar",
            "0.8.5.julietjaguar",
            "0.8.4.julietjaguar",
            "0.8.2.julietjaguar",
            "0.8.1.julietjaguar",
            "0.8.0.julietjaguar",
            "0.7.0.indiaibex",
            "0.6.0.hotelhummingbird",
            "0.5.0.golfotter",
            "0.4.0.foxtrotflamingo",
            "0.3.2.echoinchworm",
            "0.3.1.echoinchworm",
            "0.3.0.echoinchworm",
            "0.2.0.deltaocelot",
            "0.1.0.charliehorse",
            "0.0.3.bravochicken",
            "0.0.0.b",
            "0.0.0.a"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-31930.json"
          }
        }
      ],
      "modified": "2026-10-20T10:54:43.226075547Z",
      "provider": "osv",
      "references": [
        "https://github.com/concerto/concerto/pull/1558",
        "https://github.com/concerto/concerto/security/advisories"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-31930",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 385989,
  "published_at": "2021-05-19T15:15:08.85+00:00"
}