Security advisory

{
  "id": "b76c8af2bc1f617ded4a59443298ff5d2c72c193d9d10950d8d599ff66e93db0",
  "url": "https://osv.dev/vulnerability/CVE-2021-3734",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-3734",
    "summary": "yourls is vulnerable to Improper Restriction of Rendered UI Layers or Frames",
    "evidence": "osv:CVE-2021-3734",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2021-3734",
      "aliases": [
        "CVE-2021-3734",
        "GHSA-r6g8-jmj9-g945"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/yourls/yourls",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "346097e69e5671f13511f5aa6c531b62e063bd73"
                },
                {
                  "fixed": "0a70acdcfb5fcbc63dbc5750018d608288eba3fe"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:yourls:yourls:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "1.8.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "0a70acdcfb5fcbc63dbc5750018d608288eba3fe"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "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-2021-3734.json"
          }
        }
      ],
      "modified": "2026-10-20T10:54:49.337685386Z",
      "provider": "osv",
      "references": [
        "https://huntr.dev/bounties/dd2e2dbe-efe5-49ec-be11-7a7e7c41debd",
        "https://github.com/yourls/yourls/commit/0a70acdcfb5fcbc63dbc5750018d608288eba3fe"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-3734",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 386210,
  "published_at": "2021-08-26T13:15:08.677+00:00"
}