GHSA-4H7G-5542-V3FC
Vulnerability from github – Published: 2026-07-02 17:51 – Updated: 2026-07-02 17:51
VLAI
Summary
mediawiki/maps has stored XSS through the overlays parameter in the display_map parser function
Details
Summary
Stored 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.
Details
The maps extension doesn't escape overlay names before passing them to leaflet. Leaflet then inserts them as HTML: https://github.com/ProfessionalWiki/Maps/blob/ca5139fabd75f3c34f47ea3fd161306506b053bc/resources/lib/leaflet/leaflet.js#L5243
PoC
Preview the following wikitext, using the default configuration options of the extension:
{{#display_map:0,0|service=leaflet|overlays=OpenTopoMap.<img src=x onerror="alert(1);">}}
Impact
Stored XSS can be performed by any user with the edit permission.
Severity
8.6 (High)
{
"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"
}
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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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