Security advisory

{
  "id": "6c1caa1eb9537366df23317fb84ac3a5ae20c3f36f2c950971f3bfe8f1b68e5f",
  "url": "https://osv.dev/vulnerability/CVE-2019-18987",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2019-18987",
    "summary": "An issue was discovered in the AbuseFilter extension through 1.34 for MediaWiki. Once a specific abuse filter has (accidentally or otherwise) been made public, its previous versions can be exposed, thus potentially disclosing private or sensitive information within the filter's definition.",
    "evidence": "osv:CVE-2019-18987",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2019-18987",
      "aliases": [
        "CVE-2019-18987"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/wikimedia/mediawiki-extensions-abusefilter",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "3c2035dd9e2a0dc1398403fe092bcc3a90f5fec6"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:mediawiki:abusefilter:*:*:*:*:*:mediawiki:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "1.34"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "REL1_34",
            "REL1_29",
            "REL1_22",
            "REL1_21",
            "REL1_20",
            "REL1_19"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2019-18987.json"
          }
        }
      ],
      "modified": "2026-10-24T10:30:52.475089454Z",
      "provider": "osv",
      "references": [
        "https://www.mediawiki.org/wiki/Extension:AbuseFilter",
        "https://gerrit.wikimedia.org/r/q/Ic12790bd33982473f77551bde9599ed083a3e1f1",
        "https://phabricator.wikimedia.org/T237887"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2019-18987",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 437699,
  "published_at": "2019-11-15T06:15:10.333+00:00"
}