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The vulnerability tracked as CVE-2026-105648 represents an input validation flaw within the Ghost content management system. It allows unauthenticated remote attackers to trigger Server-Side Request Forgery (SSRF) by exploiting parsing gaps in IP filters. Specifically, features like Webmentions process URLs provided externally without properly restricting access to loopback or private network ranges. By leveraging specialized IPv6 transition addresses or alternative representations, an attacker can bypass standard blacklists that guard internal IP blocks. Although successful requests do not return response data back to the user interface, it exposes internal infrastructure to unauthorized scanning or interaction depending on host network setups. Remediation requires upgrading the platform package to version 6.65.0 or later to ensure complete input validation rules are enforced.
DailyCVE Form:
Platform: Ghost
Version: v6.0.9 to v6.64.0
Vulnerability : Server-Side Request Forgery
Severity: Moderate
date: October 5, 2026
Prediction: Already patched
What Undercode Say:
Analytics
Analysis shows that improper validation of input strings allows malicious actors to construct crafted URL patterns containing IPv6 transition addresses. These patterns slip past conventional regex filters designed to block RFC 1918 and loopback addresses, enabling internal port probing.
Exploit (Educational Purposes!)
curl -X POST "https://vulnerable-ghost-instance.tld/ghost/api/admin/webhooks/" \
-H "Content-Type: application/json" \
-d '{"source": "webmention", "target": "http://[::ffff:127.0.0.1]:8080/"}'
Protection
Upgrade the Ghost installation immediately to version 6.65.0 or later where strict address checking is properly implemented.
Impact
Unauthenticated attackers can force internal HTTP connections against local network services, potentially interacting with sensitive management interfaces hidden behind firewalls.
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Sources:
Reported By: github.com
Extra Source Hub:
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