{
  "affected": [
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "mediawiki/maps"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "12.1.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-52854"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79",
      "CWE-80"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-02T17:51:24Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "### Summary\nStored XSS through wikitext can be performed by inserting malicious HTML into the `overlays` parameter of the `display_map` parser function when using the leaflet service.\n\n### Details\nThe maps extension doesn\u0027t escape overlay names before passing them to leaflet.\nLeaflet then inserts them as HTML: https://github.com/ProfessionalWiki/Maps/blob/ca5139fabd75f3c34f47ea3fd161306506b053bc/resources/lib/leaflet/leaflet.js#L5243\n\n### PoC\nPreview the following wikitext, using the default configuration options of the extension:\n```\n{{#display_map:0,0|service=leaflet|overlays=OpenTopoMap.\u003cimg src=x onerror=\"alert(1);\"\u003e}}\n```\n\n### Impact\nStored XSS can be performed by any user with the `edit` permission.",
  "id": "GHSA-4h7g-5542-v3fc",
  "modified": "2026-07-02T17:51:24Z",
  "published": "2026-07-02T17:51:24Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/ProfessionalWiki/Maps/security/advisories/GHSA-4h7g-5542-v3fc"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/ProfessionalWiki/Maps"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "mediawiki/maps has stored XSS through the overlays parameter in the display_map parser function"
}