Security advisory

{
  "id": "d491eff284bad8f87605283d7a63a800ebbf217a68356ffa6a9d78e75340e100",
  "url": "https://osv.dev/vulnerability/CVE-2021-4253",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-4253",
    "summary": "A vulnerability, which was classified as problematic, was found in ctrlo lenio. Affected is an unknown function in the library lib/Lenio.pm of the component Ticket Handler. The manipulation of the argument site_id leads to cross site scripting. It is possible to launch the attack remotely. The name of the patch is 7a1f90bd2a0ce95b8338ec0926902da975ec64d9. It is recommended to apply a patch to fix this issue. VDB-216210 is the identifier assigned to this vulnerability.",
    "evidence": "osv:CVE-2021-4253",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2021-4253",
      "aliases": [
        "CVE-2021-4253"
      ],
      "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/ctrlo/lenio",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "7a1f90bd2a0ce95b8338ec0926902da975ec64d9"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "fixed": "7a1f90bd2a0ce95b8338ec0926902da975ec64d9"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-4253.json"
          }
        }
      ],
      "modified": "2026-10-20T10:55:01.205895003Z",
      "provider": "osv",
      "references": [
        "https://vuldb.com/?id.216210",
        "https://github.com/ctrlo/lenio/commit/7a1f90bd2a0ce95b8338ec0926902da975ec64d9"
      ],
      "provider_metadata": {
        "unresolved_ranges": [
          {
            "cpes": [
              "cpe:2.3:a:ctrlo:lenio:*:*:*:*:*:*:*:*"
            ],
            "vendor_product": "ctrlo:lenio",
            "extracted_events": [
              {
                "range": [
                  {
                    "fixed": "2021-02-09"
                  }
                ],
                "source": "CPE_RANGE"
              }
            ]
          }
        ]
      }
    },
    "related_cves": [
      {
        "value": "CVE-2021-4253",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 386693,
  "published_at": "2022-12-18T22:15:10.317+00:00"
}