Security advisory

{
  "id": "2bb42fb036bd2e667a53951946ee564bd1481a4e213d7f3951219443bab8e4e1",
  "url": "https://osv.dev/vulnerability/CVE-2021-3783",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-3783",
    "summary": "yourls is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')",
    "evidence": "osv:CVE-2021-3783",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2021-3783",
      "aliases": [
        "CVE-2021-3783",
        "GHSA-cpq8-x35g-m439"
      ],
      "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/yourls/yourls",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "5ba814fa0ce664754a81fed328002ebf041a0f6e"
                },
                {
                  "fixed": "94f6bab91182142c96ff11f481585b445449efd4"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:yourls:yourls:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "1.8.2"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "94f6bab91182142c96ff11f481585b445449efd4"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "1.8.2",
            "1.8.1",
            "1.8",
            "1.7.9",
            "1.7.6",
            "1.7.5",
            "1.7.4",
            "1.7.3",
            "1.7.1",
            "1.7.2",
            "1.7",
            "1.6",
            "1.5.1",
            "1.5",
            "1.4.3",
            "1.4.2",
            "1.4.1",
            "1.4",
            "1.2",
            "1.1",
            "1.0.1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-3783.json"
          }
        }
      ],
      "modified": "2026-10-20T10:54:50.377504045Z",
      "provider": "osv",
      "references": [
        "https://github.com/yourls/yourls/commit/94f6bab91182142c96ff11f481585b445449efd4",
        "https://huntr.dev/bounties/b688e553-d0d9-4ddf-95a3-ff4b78004984"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-3783",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 386250,
  "published_at": "2021-09-15T12:15:16.207+00:00"
}