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CVE-2026-52854 high CVSS 8.6

Cross-Site Scripting (XSS) in mediawiki/maps (CVE-2026-52854)

Summary

Cross-site scripting in mediawiki/maps (CVE-2026-52854). Confidential information can be exposed externally. Exploitable via overlays. Mitigation: upgrade to 12.1.3 or later.

Original description

The description as published by the source.

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.}}

Impact

Stored XSS can be performed by any user with the edit permission.

Source: GitHub Security Advisories (Global) NVD GitHub Advisory

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A vulnerability tracked as CVE-2026-52854 has been found in mediawiki/maps.
Attackers can target a specific entry point like overlays over the network to misuse the product.
Confidential information can be exposed externally. CVSS score: 8.6/10.
What to do: upgrade mediawiki/maps to 12.1.3 or later.
If unsure, ask your IT team or search "mediawiki/maps CVE-2026-52854" on the vendor's site.

CVE-2026-52854 (mediawiki/maps) — CWE-79 / CVSS v3 8.6
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Attack surface: overlays / display_map / edit
Patched: 12.1.3 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.

❓ What is the problem

Cross-site scripting (XSS) (CWE-79) exists in mediawiki/maps. Attackers reach the vulnerable code path via overlays without authentication.

📍 Affected scope

Check the vendor advisory for the affected versions of mediawiki/maps. Attack surface: overlays / display_map / edit.

🔥 Severity

Severity: High (CVSS 8.6/10). Confidential information can be exposed externally.

🔧 How to fix

Update to 12.1.3.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'mediawiki/maps' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

  1. 1
    Identify exposure identify 
    grep -r 'mediawiki/maps' . | grep -v node_modules

    リポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で mediawiki/maps を grep し、稼働しているサービス・バージョンを把握する。

  2. 2
    Apply patch patch 
    Upgrade mediawiki/maps to 12.1.3

    ステージング環境で 12.1.3 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。

  3. 3
    Post-deployment verification verify 
    Confirm patched version is live in production

    パッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

Affected packages

composer mediawiki/maps
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"12.1.3"}]}]
Packagist mediawiki/maps
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"12.1.3"}]}]

Fix status by distribution

Fixed packages published by each distribution for this CVE

References

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