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CVE-2021-21365

Cross-Site Scripting (XSS) in bk2k/bootstrap-package (CVE-2021-21365)

Summary

Cross-site scripting in bk2k/bootstrap-package (CVE-2021-21365). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to 11.0.3 or later.

Original description

The description as published by the source.

Problem

It has been discovered that rendering content in the website frontend is vulnerable to cross-site scripting. A valid backend user account is needed to exploit this vulnerability.

The following templates are affected by the vulnerability:

  • Resources/Private/Partials/ContentElements/Carousel/Item/CallToAction.html
  • Resources/Private/Partials/ContentElements/Carousel/Item/Header.html
  • Resources/Private/Partials/ContentElements/Carousel/Item/Text.html
  • Resources/Private/Partials/ContentElements/Carousel/Item/TextAndImage.html
  • Resources/Private/Partials/ContentElements/Header/SubHeader.html

Users of the extension, who have overwritten the affected templates with custom code must manually apply the security fix as shown in this Git commit.

Solution

Update to version 7.1.2, 8.0.8, 9.0.4, 9.1.3, 10.0.10 or 11.0.3 of the Bootstrap Package that fix the problem described.

Updated version are available from the TYPO3 extension manager, Packagist and at https://extensions.typo3.org/extension/download/bootstrap_package/.

Credits

Thanks to TYPO3 security team member Oliver Hader who reported and fixed the issue.

Source: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV

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-2021-21365 has been found in bk2k/bootstrap-package.
Risk of unauthorized operations or information disclosure.
What to do: upgrade bk2k/bootstrap-package to 11.0.3 or later.
If unsure, ask your IT team or search "bk2k/bootstrap-package CVE-2021-21365" on the vendor's site.

CVE-2021-21365 (bk2k/bootstrap-package) — CWE-79
Attack vector: remote (network-reachable)
Patched: 11.0.3 — 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 bk2k/bootstrap-package.

📍 Affected scope

Check the vendor advisory for the affected versions of bk2k/bootstrap-package.

🔥 Severity

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

🔧 How to fix

Update to 11.0.3.

🛡️ 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 'bk2k/bootstrap-package' . 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 'bk2k/bootstrap-package' . | 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 bk2k/bootstrap-package 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 bk2k/bootstrap-package to 11.0.3

    ステージング環境で 11.0.3 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

Packagist bk2k/bootstrap-package
[{"type":"ECOSYSTEM","events":[{"introduced":"11.0.0"},{"fixed":"11.0.3"}]}]

References

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