Vulnerability in ghost (CVE-2026-53945)
Summary
Vulnerability in ghost (CVE-2026-53945). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to 6.21.1 or later.
Original description
The description as published by the source.
Ghost is a Node.js content management system. From 6.0.9 until 6.21.1, Ghost’s private-IP check for outbound HTTP requests could be bypassed via DNS rebinding, allowing an attacker to coerce the Ghost server into reaching hosts on internal networks through features that issue external fetches. This vulnerability is fixed in 6.21.1.
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-2026-53945 has been found in ghost.
Risk of unauthorized operations or information disclosure. CVSS score: 4.0/10.
What to do: upgrade ghost to 6.21.1 or later.
If unsure, ask your IT team or search "ghost CVE-2026-53945" on the vendor's site.
CVE-2026-53945 (ghost) — CWE-367 / CVSS v3 4.0
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Patched: 6.21.1 — apply immediately
Workaround: If upgrading immediately is not possible, operators can reduce exposure by preventing the Ghost server from reaching sensitive internal ranges at the network layer — for example, egress firewall rules that block the Ghost process from initiating conn
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-367) exists in ghost.
Check the vendor advisory for the affected versions of ghost.
Severity: Medium (CVSS 4.0/10). Risk of unauthorized operations or information disclosure.
Update to 6.21.1.
Workaround: If upgrading immediately is not possible, operators can reduce exposure by preventing the Ghost server from reaching sensitive internal ranges at the network layer — for example, egress firewall rules that block the Ghost process from initiating conn
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
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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
If upgrading immediately is not possible, operators can reduce exposure by preventing the Ghost server from reaching sensitive internal ranges at the network layer — for example, egress firewall rules that block the Ghost process from initiating connパッチが適用されるまでの応急処置として、If upgrading immediately is not possible, operators can reduce exposure by preventing the Ghost server from reaching sensitive internal ranges at the network layer — for example, egress firewall rules that block the Ghost process from initiating conn を実施。回避策の副作用 (機能低下) を確認した上で。
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3Apply patch patch
Upgrade ghost to 6.21.1ステージング環境で 6.21.1 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を含めること。
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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
- web github.com
- web github.com
- web github.com