Security advisory

{
  "id": "2309d206140bd45f5096897e6d52b555270e6b8b6bee90949627c9c89bd5f320",
  "url": "https://osv.dev/vulnerability/CVE-2021-35210",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-35210",
    "summary": "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.",
    "evidence": "osv:CVE-2021-35210",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2021-35210",
      "aliases": [
        "CVE-2021-35210",
        "GHSA-h58v-c6rf-g9f7"
      ],
      "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/contao/contao",
              "type": "GIT",
              "events": [
                {
                  "introduced": "b09b4d51d13d37b4bfcd2ef4314fc6a20184dc55"
                },
                {
                  "fixed": "53bac8ab1a1fab41e039321ba0ec6ee4f4b45fb2"
                },
                {
                  "introduced": "5a25b1d689ffde95a00427bdfde03695a2c645c3"
                },
                {
                  "fixed": "b884e57060ce4897bf78c11b252466f80a4a0908"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:contao:contao:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "4.5.0"
                      },
                      {
                        "fixed": "4.9.16"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:contao:contao:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "4.10.0"
                      },
                      {
                        "fixed": "4.11.5"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-35210.json"
          }
        }
      ],
      "modified": "2026-10-20T10:53:49.226965028Z",
      "provider": "osv",
      "references": [
        "https://contao.org/en/security-advisories/cross-site-scripting-in-the-system-log-2021.html",
        "https://github.com/contao/contao/security/advisories/GHSA-h58v-c6rf-g9f7"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-35210",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 384667,
  "published_at": "2021-06-23T11:15:08.17+00:00"
}