{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "versions": [
              {
                "introduced": "4.5.0"
              },
              {
                "fixed": "4.9.16"
              },
              {
                "introduced": "4.10.0"
              },
              {
                "fixed": "4.11.5"
              }
            ]
          },
          "events": [
            {
              "introduced": "b09b4d51d13d37b4bfcd2ef4314fc6a20184dc55"
            },
            {
              "fixed": "53bac8ab1a1fab41e039321ba0ec6ee4f4b45fb2"
            },
            {
              "introduced": "5a25b1d689ffde95a00427bdfde03695a2c645c3"
            },
            {
              "fixed": "b884e57060ce4897bf78c11b252466f80a4a0908"
            }
          ],
          "repo": "https://github.com/contao/contao",
          "type": "GIT"
        }
      ]
    }
  ],
  "details": "Contao 4.5.x through 4.9.x before 4.9.16, and 4.10.x through 4.11.x before 4.11.5, allows XSS. It is possible to inject code into the tl_log table that will be executed in the browser when the system log is called in the back end.",
  "id": "CVE-2021-35210",
  "modified": "2026-04-01T23:08:52.995504872Z",
  "published": "2021-06-23T11:15:08.170Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://contao.org/en/security-advisories/cross-site-scripting-in-the-system-log-2021.html"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/contao/contao/security/advisories/GHSA-h58v-c6rf-g9f7"
    }
  ],
  "related": [
    "GHSA-h58v-c6rf-g9f7"
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ]
}