Cross-Site Scripting (XSS) in nodebb (CVE-2021-43787)
Summary
Cross-site scripting in nodebb (CVE-2021-43787). Successful exploitation can lead to full system takeover. Mitigation: upgrade to 1.18.5 or later.
Original description
The description as published by the source.
Impact
A prototype pollution vulnerability in the uploader module allowed a malicious user to inject arbitrary data (i.e. javascript) into the DOM, theoretically allowing for an account takeover when used in conjunction with a path traversal vulnerability disclosed at the same time as this report.
Patches
The vulnerability has been patched as of v1.18.5.
Workarounds
Cherry-pick commit hash 1783f918bc19568f421473824461ff2ed7755e4c to receive this patch in lieu of a full upgrade.
For more information
If you have any questions or comments about this advisory:
- Email us at security@nodebb.org
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-2021-43787 has been found in nodebb.
Successful exploitation can lead to full system takeover.
What to do: upgrade nodebb to 1.18.5 or later.
If unsure, ask your IT team or search "nodebb CVE-2021-43787" on the vendor's site.
CVE-2021-43787 (nodebb) — CWE-79
Attack vector: remote (network-reachable)
Patched: 1.18.5 — apply immediately
Workaround: Cherry-pick commit hash 1783f918bc19568f421473824461ff2ed7755e4c to receive this patch in lieu of a full upgrade.
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.
Cross-site scripting (XSS) (CWE-79) exists in nodebb.
Check the vendor advisory for the affected versions of nodebb.
Severity: ?. Successful exploitation can lead to full system takeover.
Update to 1.18.5.
Workaround: Cherry-pick commit hash 1783f918bc19568f421473824461ff2ed7755e4c to receive this patch in lieu of a full upgrade.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'nodebb' . 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
-
1Identify exposure identify
grep -r 'nodebb' . | 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
nodebbを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply temporary workaround mitigate
Cherry-pick commit hash 1783f918bc19568f421473824461ff2ed7755e4c to receive this patch in lieu of a full upgrade.パッチが適用されるまでの応急処置として、Cherry-pick commit hash 1783f918bc19568f421473824461ff2ed7755e4c to receive this patch in lieu of a full upgrade. を実施。回避策の副作用 (機能低下) を確認した上で。
-
3Apply patch patch
Upgrade nodebb to 1.18.5ステージング環境で 1.18.5 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。
-
4Post-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
References
- advisory nvd.nist.gov
- package github.com
- web github.com
- web github.com
- web blog.sonarsource.com
- web github.com