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CVE-2026-55087 medium CVSS 6.1

Cross-Site Scripting (XSS) in ep_etherpad-lite (CVE-2026-55087)

Summary

cross-site scripting in ep_etherpad-lite (CVE-2026-55087). Risk of unauthorized operations or information disclosure. Exploitable via ``String.prototype.replaceAll``. Mitigation: upgrade to `3.1.0` or later.

AI summary snake-internal / snake-material-v2

A vulnerability tracked as **CVE-2026-55087** has been found in ep_etherpad-lite. Attackers can target a specific entry point like ``String.prototype.replaceAll`` over the network to misuse the product. Risk of unauthorized operations or information disclosure. CVSS score: 6.1/10. What to do: upgrade ep_etherpad-lite to **3.1.0** or later. If unsure, ask your IT team or search "ep_etherpad-lite CVE-2026-55087" on the vendor's site.
CVE-2026-55087 (ep_etherpad-lite) — CWE-79 / CVSS v3 6.1 Attack vector: remote (network-reachable) / unauthenticated Attack surface: `String.prototype.replaceAll` / `Vary` / `sanitizeProxyPath` / `Location` Patched: `3.1.0` — 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 ep_etherpad-lite. Attackers reach the vulnerable code path via ``String.prototype.replaceAll`` without authentication.
📍 Affected scope
ep_etherpad-lite — . Attack surface: `String.prototype.replaceAll` / `Vary` / `sanitizeProxyPath` / `Location`.
🔥 Severity
Severity: Medium (CVSS 6.1/10). Risk of unauthorized operations or information disclosure
🔧 How to fix
Update to **3.1.0**.
🛡️ 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 'ep_etherpad-lite' .` against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.

Response Actions (7 steps)

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

  1. 1
    Identify exposure identify 
    grep -r 'ep_etherpad-lite' . | 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 `ep_etherpad-lite` を grep し、稼働しているサービス・バージョンを把握する。

  2. 6
    Apply patch patch 
    Upgrade ep_etherpad-lite to 3.1.0

    ステージング環境で 3.1.0 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 3 で見つけた異常検知の続報チェックを含めること。

  3. 7
    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 Step 3 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 ep_etherpad-lite
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.1.0"}]}]

References

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