{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "versions": [
              {
                "introduced": "3.9.0"
              },
              {
                "fixed": "3.9.14"
              }
            ]
          },
          "events": [
            {
              "introduced": "a2b9beda71c3603b0f0da0ab70bb30cd976ec123"
            },
            {
              "fixed": "e5dc4beb39b7edbbd4eec187dad7162798b77da2"
            }
          ],
          "repo": "https://github.com/joomla/joomla-cms",
          "type": "GIT"
        }
      ]
    }
  ],
  "details": "An issue was discovered in Joomla! before 3.9.15. Inadequate escaping of usernames allows XSS attacks in com_actionlogs.",
  "id": "CVE-2020-8421",
  "modified": "2026-03-13T21:56:54.221647900Z",
  "published": "2020-01-28T21:15:12.123Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://developer.joomla.org/security-centre/800-20200103-core-xss-in-com-actionlogs"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ]
}