{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "1.5.1"
              },
              {
                "fixed": "1.10.4"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "c153cc47febfad72f20d4ab1f344f7d029aa0ffc"
            },
            {
              "fixed": "e1e93476655107e6caab34e52259eb1c91079ec7"
            },
            {
              "fixed": "ef695ea14d89d920e771a88f32cbe0485256366a"
            }
          ],
          "repo": "https://github.com/yourls/yourls",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-5h77-88j3-r659"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-79"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63135.json"
  },
  "details": "YOURLS is a self-hosted, customizable URL shortener written in PHP. From 1.5.1 until 1.10.4, YOURLS stores the HTTP Referer header through yourls_get_referrer(), yourls_sanitize_url_safe(), and yourls_log_redirect(), then aggregates the value in yourls-infos.php and passes the derived domain through yourls_get_domain(), yourls_stats_pie(), and yourls_google_array_to_data_table(). The chart builder concatenates labels into inline JavaScript without JavaScript-string escaping, so an unauthenticated attacker can poison the statistics of an existing short URL with a crafted referrer. When an administrator or public stats-page viewer opens the affected statistics page, attacker-controlled JavaScript executes in the YOURLS origin and can access admin-visible data, the API signature token, and privileged same-origin actions. This issue is fixed in version 1.10.4.",
  "id": "CVE-2026-63135",
  "modified": "2026-09-11T03:30:50.549450999Z",
  "published": "2026-08-21T20:40:08.199Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/YOURLS/YOURLS/releases/tag/1.10.4"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63135.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/YOURLS/YOURLS/security/advisories/GHSA-5h77-88j3-r659"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-63135"
    },
    {
      "type": "FIX",
      "url": "https://github.com/YOURLS/YOURLS/commit/e1e93476655107e6caab34e52259eb1c91079ec7"
    },
    {
      "type": "FIX",
      "url": "https://github.com/YOURLS/YOURLS/pull/4107"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "YOURLS: Stored XSS in referrer statistics chart via crafted Referer header"
}