Security advisory

{
  "id": "a52ea86db9bdbfb017a1a5a371f523aa596d08c5fa48b302d4f51e6d9fd7ea32",
  "url": "https://osv.dev/vulnerability/CVE-2020-35478",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2020-35478",
    "summary": "MediaWiki before 1.35.1 allows XSS via BlockLogFormatter.php. MediaWiki:blanknamespace potentially can be output as raw HTML with SCRIPT tags via LogFormatter::makePageLink(). This affects MediaWiki 1.33.0 and later.",
    "evidence": "osv:CVE-2020-35478",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2020-35478",
      "aliases": [
        "BIT-mediawiki-2020-35478",
        "CVE-2020-35478"
      ],
      "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/wikimedia/mediawiki",
              "type": "GIT",
              "events": [
                {
                  "introduced": "a1742c4f4b2c331a44ba1d80bf1431ddfb9ef678"
                },
                {
                  "fixed": "3e26b5ff1468f98cf306575d125b29a6645bf2ea"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:mediawiki:mediawiki:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "1.33.0"
                      },
                      {
                        "fixed": "1.35.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-35478.json"
          }
        }
      ],
      "modified": "2026-10-24T10:30:28.607318629Z",
      "provider": "osv",
      "references": [
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/STT5Z4A3BCXVH3WIPICWU2FP4IPIMUPC/",
        "https://lists.wikimedia.org/pipermail/mediawiki-announce/2020-December/000268.html",
        "https://phabricator.wikimedia.org/T268938"
      ],
      "provider_metadata": {
        "unresolved_ranges": [
          {
            "cpes": [
              "cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*"
            ],
            "vendor_product": "fedoraproject:fedora",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "33"
                  },
                  {
                    "last_affected": "33"
                  }
                ],
                "source": "CPE_STRING"
              }
            ]
          }
        ]
      }
    },
    "related_cves": [
      {
        "value": "CVE-2020-35478",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 432082,
  "published_at": "2020-12-18T08:15:15.293+00:00"
}