Security advisory

{
  "id": "e737e348781bd333a5cc572865a144c974a25d0ba10eb4aaf7b8eec6ec722b8d",
  "url": "https://osv.dev/vulnerability/CVE-2023-37303",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2023-37303",
    "summary": "An issue was discovered in the CheckUser extension for MediaWiki through 1.39.3. In certain situations, an attempt to block a user fails after a temporary browser hang and a DBQueryDisconnectedError error message.",
    "evidence": "osv:CVE-2023-37303",
    "products": [],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2023-37303",
      "aliases": [
        "BIT-mediawiki-2023-37303",
        "CVE-2023-37303"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/wikimedia/mediawiki",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "2fdadd4096268cebab8fbc2f245dd441e2f05536"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:mediawiki:mediawiki:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "1.39.3"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "1.39.3",
            "1.39.2",
            "1.39.1",
            "1.39.0",
            "1.39.0-rc.1",
            "1.39.0-rc.0",
            "test-hashar-for-ci",
            "1.6.0",
            "1.5.0beta4",
            "1.5.0beta3",
            "1.5.0beta2",
            "1.5.0beta1",
            "1.5.0alpha2",
            "1.5.0alpha1",
            "1.3.0beta1",
            "1.1.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-37303.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:52.124270327Z",
      "provider": "osv",
      "references": [
        "https://gerrit.wikimedia.org/r/q/I10a9273c542576b3f7bb38de68dcd2aa41cfb1b0",
        "https://phabricator.wikimedia.org/T338276",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/37xxx/CVE-2023-37303.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2023-37303"
      ],
      "provider_metadata": {
        "cna_assigner": "mitre",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/37xxx/CVE-2023-37303.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2023-37303",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 520947,
  "published_at": "2023-06-30T00:00:00+00:00"
}