Sign in Sign up
JA · EN · FR
SecPulse
Categories
CVE-2026-54606

Cross-Site Scripting (XSS) in suneditor (CVE-2026-54606)

Summary

Cross-site scripting in suneditor (CVE-2026-54606). Risk of unauthorized operations or information disclosure. Exploitable via GET /poc.js. Mitigation: upgrade to 3.1.4 or later.

Original description

The description as published by the source.

Summary

A DOM-based Cross-Site Scripting (XSS) vulnerability exists in the SunEditor Embed plugin. Crafted iframe embed HTML followed by an external element bypasses the plugin’s sanitization logic. The plugin recreates and appends the attacker-controlled script element to the live DOM, causing JavaScript execution in the context of the editor page.

If an application stores or reflects SunEditor content without additional backend sanitization, this can lead to stored or reflected XSS when another user opens, previews, renders, or edits the malicious content.

Details

The Embed plugin parses raw embed HTML and processes the resulting DOM nodes. When a element is included after a valid iframe, the plugin creates a new script element using the attacker-controlled src value and appends it to the DOM.

Relevant behavior:

const embedDOM = new DOMParser().parseFromString(src, 'text/html').body.children;
if (/^script$/i.test(chd.nodeName)) {
scriptTag = dom.utils.createElement('script', {
src: chd.getAttribute('src'),
async: 'true'
}, null);
continue;
}
cover.appendChild(scriptTag);

Because the script is newly created and appended, it executes.

PoC

Start a local server hosting a JavaScript payload:

mkdir -p /tmp/suneditor-poc
cd /tmp/suneditor-poc

cat > poc.js <<'EOF'
alert(1);
console.log("SunEditor Embed Plugin XSS executed");
EOF

python3 -m http.server 8000

Open SunEditor with the Embed plugin enabled, then insert the following payload through th…

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-2026-54606 has been found in suneditor.
Attackers can target a specific entry point like GET /poc.js over the network to misuse the product.
Risk of unauthorized operations or information disclosure.
What to do: upgrade suneditor to 3.1.4 or later.
If unsure, ask your IT team or search "suneditor CVE-2026-54606" on the vendor's site.

CVE-2026-54606 (suneditor) — CWE-79
Attack surface: GET /poc.js
Patched: 3.1.4 — 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 suneditor. Attackers reach the vulnerable code path via GET /poc.js.

📍 Affected scope

Check the vendor advisory for the affected versions of suneditor. Attack surface: GET /poc.js.

🔥 Severity

Severity: ?. Risk of unauthorized operations or information disclosure.

🔧 How to fix

Update to 3.1.4.

🛡️ 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 GET /poc.js requests with malformed payloads or SQL meta-characters. Run grep -r 'suneditor' . 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 'suneditor' . | 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 suneditor 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
    Hunt for indicators of compromise detect 
    grep 'GET /poc.js' /var/log/nginx/access.log | grep -E '(unusual_payload|sqli_pattern)'

    アクセスログで GET /poc.js への異常なリクエスト (不正な認証ヘッダ・SQLメタ文字)を過去 30〜90日分捜索。WAF/SIEM があれば該当パスのアラート発火履歴を確認。

  3. 3
    Apply patch patch 
    Upgrade suneditor to 3.1.4

    ステージング環境で 3.1.4 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と、Step 2 で見つけた異常検知の続報チェックを含めること。

  4. 4
    Post-deployment verification verify 
    Replay attack against GET /poc.js on staging to confirm patch closes the vector

    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 Step 2 と同じログクエリでアラート再発が無いか継続監視。

Affected packages

npm suneditor
[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"3.1.4"}]}]

References

We use cookies for analytics and ad measurement. This setting applies to all Game co., Ltd. sites. Details