Vulnerability in ghost (CVE-2026-53943)
Summary
Vulnerability in ghost (CVE-2026-53943). Successful exploitation can lead to full system takeover. Mitigation: upgrade to 6.37.0 or later.
Original description
The description as published by the source.
Ghost is a Node.js content management system. From until 6.37.0, when Ghost is behind a shared caching layer that results in cached content being shared between different visitors, an unauthenticated user could send an x-ghost-preview header that altered the rendered frontend response. In affected cache configurations, that response could be stored and served to subsequent visitors requesting the same page, allowing cache poisoning of request-specific preview output. When running Ghost's frontend and admin panel on the same domain this could be used to take over staff user accounts. When running these on different domains staff accounts have no exposure. This vulnerability is fixed in 6.37.0.
Source: NIST National Vulnerability Database NVD GitHub Advisory
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-2026-53943 has been found in ghost.
Successful exploitation can lead to full system takeover. CVSS score: 9.6/10.
What to do: upgrade ghost to 6.37.0 or later.
If unsure, ask your IT team or search "ghost CVE-2026-53943" on the vendor's site.
CVE-2026-53943 (ghost) — CWE-524 / CVSS v3 9.6
Attack vector: remote (network-reachable) / unauthenticated
Patched: 6.37.0 — apply immediately
Workaround: At the caching layer, bypass the cache for x-ghost-preview requests.
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.
A vulnerability (CWE-524) exists in ghost.
Check the vendor advisory for the affected versions of ghost.
Severity: Critical (CVSS 9.6/10). Successful exploitation can lead to full system takeover.
Update to 6.37.0.
Workaround: At the caching layer, bypass the cache for x-ghost-preview requests.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'ghost' . 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 'ghost' . | 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
ghost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
At the caching layer, bypass the cache for `x-ghost-preview` requests.パッチが適用されるまでの応急処置として、At the caching layer, bypass the cache for
x-ghost-previewrequests. 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 ghost to 6.37.0ステージング環境で 6.37.0 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 github.com
- advisory nvd.nist.gov
- advisory github.com
- package github.com
- web github.com