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CVE-2019-8331

Cross-Site Scripting (XSS) in bootstrap (CVE-2019-8331)

Summary

cross-site scripting in bootstrap (CVE-2019-8331). Risk of unauthorized operations or information disclosure. Exploitable via ``bootstrap``. Mitigation: upgrade to `4.3.1` or later.

AI summary snake-internal / snake-material-v2

A vulnerability tracked as **CVE-2019-8331** has been found in bootstrap. Attackers can target a specific entry point like ``bootstrap`` over the network to misuse the product. Risk of unauthorized operations or information disclosure. CVSS score: ?/10. What to do: upgrade bootstrap to **4.3.1** or later. If unsure, ask your IT team or search "bootstrap CVE-2019-8331" on the vendor's site.
CVE-2019-8331 (bootstrap) — CWE-79 / Attack vector: remote (network-reachable) / unauthenticated Attack surface: `bootstrap` Patched: `4.3.1` — 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 bootstrap. Attackers reach the vulnerable code path via ``bootstrap`` without authentication.
📍 Affected scope
bootstrap — . Attack surface: `bootstrap`.
🔥 Severity
Severity: ?. Risk of unauthorized operations or information disclosure
🔧 How to fix
Update to **4.3.1**.
🛡️ 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 'bootstrap' .` 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 'bootstrap' . | 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 `bootstrap` 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 bootstrap to 4.3.1

    ステージング環境で 4.3.1 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

rubygems bootstrap
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.3.1"}]}]
rubygems bootstrap-sass
[{"type":"ECOSYSTEM","events":[{"introduced":"3.0.0"},{"fixed":"3.4.1"}]}]
nuget Bootstrap.Less
[{"type":"ECOSYSTEM","events":[{"introduced":"3.0.0"},{"fixed":"3.4.1"}]}]
nuget bootstrap
[{"type":"ECOSYSTEM","events":[{"introduced":"3.0.0"},{"fixed":"3.4.1"}]}]
nuget bootstrap.sass
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.3.1"}]}]
npm bootstrap
[{"type":"SEMVER","events":[{"introduced":"3.0.0"},{"fixed":"3.4.1"}]}]
npm bootstrap-sass
[{"type":"SEMVER","events":[{"introduced":"3.0.0"},{"fixed":"3.4.1"}]}]
maven org.webjars:bootstrap
[{"type":"ECOSYSTEM","events":[{"introduced":"4.0.0"},{"fixed":"4.3.1"}]}]
composer twbs/bootstrap
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.3.1"}]}]
rubygems twitter-bootstrap-rails
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.3.0"}]}]
Packagist twbs/bootstrap
[{"type":"ECOSYSTEM","events":[{"introduced":"4.0.0"},{"fixed":"4.3.1"}]}]

References

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