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CVE-2026-105649 high CVSS 7.3

Cross-Site Scripting (XSS) in ghost (CVE-2026-105649)

Summary

Cross-site scripting in ghost (CVE-2026-105649). Confidential information can be exposed externally. Mitigation: upgrade to 6.65.0 or later.

Original description

The description as published by the source.

Impact

SVG media thumbnails, and SVG images uploaded with a non-SVG file extension, were stored without sanitization. This allowed any staff user, including Contributors, to host scripts on the site's domain, possibly resulting in compromise of other staff users' admin sessions.

Vulnerable versions

This vulnerability is present in Ghost from v4.22.0 up to v6.64.0.

Patches

v6.65.0 contains a fix for this issue.

How to update

For self-hosters using Docker, find Docker's official Ghost image here. Updating a Docker-based Ghost instance is documented here.

If your Ghost is a Ghost-CLI install see our documentation on updating it to the latest version here.

References

Ghost thanks Ibrahim AlJaafreh of Cystack Red Team, Anand Prajapati, 白墨, and Nhat Anh Vu for disclosing this vulnerability responsibly.

For more information

If you have any questions or comments about this advisory, email us at security@ghost.org.

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-2026-105649 has been found in ghost.
Confidential information can be exposed externally. CVSS score: 7.3/10.
What to do: upgrade ghost to 6.65.0 or later.
If unsure, ask your IT team or search "ghost CVE-2026-105649" on the vendor's site.

CVE-2026-105649 (ghost) — CWE-79 / CVSS v3 7.3
Attack vector: remote (network-reachable)
Patched: 6.65.0 — 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 ghost.

📍 Affected scope

Check the vendor advisory for the affected versions of ghost.

🔥 Severity

Severity: High (CVSS 7.3/10). Confidential information can be exposed externally.

🔧 How to fix

Update to 6.65.0.

🛡️ 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 '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

  1. 1
    Identify 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。

  2. 2
    Apply patch patch 
    Upgrade ghost to 6.65.0

    ステージング環境で 6.65.0 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。

  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 ghost
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.65.0"}]}]

References

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