Sign in Sign up
JA · EN · FR
SecPulse
Categories
CVE-2021-37695

Cross-Site Scripting (XSS) in ckeditor4 (CVE-2021-37695)

Summary

Cross-site scripting in ckeditor4 (CVE-2021-37695). Confidential information can be exposed externally. Mitigation: upgrade to 4.16.2 or later.

Original description

The description as published by the source.

Affected packages

The vulnerability has been discovered in Fake Objects plugin. All plugins with Fake Objects plugin dependency are affected:

Impact

A potential vulnerability has been discovered in CKEditor 4 Fake Objects package. The vulnerability allowed to inject malformed Fake Objects HTML, which could result in executing JavaScript code. It affects all users using the CKEditor 4 plugins listed above at version < 4.16.2.

Patches

The problem has been recognized and patched. The fix will be available in version 4.16.2.

For more information

Email us at security@cksource.com if you have any questions or comments about this advisory.

Acknowledgements

The CKEditor 4 team would like to thank Mika Kulmala (kulmik) for recognizing and reporting this vulnerability.

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-2021-37695 has been found in ckeditor4.
Confidential information can be exposed externally.
What to do: upgrade ckeditor4 to 4.16.2 or later.
If unsure, ask your IT team or search "ckeditor4 CVE-2021-37695" on the vendor's site.

CVE-2021-37695 (ckeditor4) — CWE-79
Attack vector: remote (network-reachable)
Patched: 4.16.2 — 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 ckeditor4.

📍 Affected scope

Check the vendor advisory for the affected versions of ckeditor4.

🔥 Severity

Severity: ?. Confidential information can be exposed externally.

🔧 How to fix

Update to 4.16.2.

🛡️ 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 'ckeditor4' . 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 'ckeditor4' . | 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 ckeditor4 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 ckeditor4 to 4.16.2

    ステージング環境で 4.16.2 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

npm ckeditor4
[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"4.16.2"}]}]

Fix status by distribution

Fixed packages published by each distribution for this CVE

References

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