{"vulnerability": "GHSA-gcvv-72q8-9v76", "sightings": [{"uuid": "cb941357-b895-4c82-ad6e-cf5bd32d685a", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "GHSA-gcvv-72q8-9v76", "type": "seen", "source": "https://gist.github.com/alon710/f018a48cf6aafd68bd8bc1eabe897a46", "content": "# CVE-2026-70591: CVE-2026-70591: Server-Side Request Forgery in Ghost Admin Image Fetching\n\n> **CVSS Score:** 4.1\n> **Published:** 2026-08-04\n> **Full Report:** https://cvereports.com/reports/CVE-2026-70591\n\n## Summary\nA comprehensive technical analysis of CVE-2026-70591, a Server-Side Request Forgery (SSRF) vulnerability identified in the Ghost Content Management System. The flaw resides in the server-side image fetching mechanism of the ImageSize class, which allows authenticated, staff-level users to force the backend to perform unvalidated HTTP GET requests targeting local or private network services. This report provides an in-depth exploration of the root cause, vulnerable code structures, patch implementations, and mitigation steps.\n\n## TL;DR\nServer-Side Request Forgery (SSRF) in Ghost CMS (versions < 6.54.1) allows authenticated staff-level users to execute arbitrary HTTP GET requests targeting local or private network services through the admin console's image processing module.\n\n## Exploit Status: POC\n\n## Technical Details\n\n- **CWE ID**: CWE-918\n- **Attack Vector**: Network (AV:N)\n- **CVSS Score**: 4.1 (Medium)\n- **Exploit Status**: PoC / Authenticated\n- **Impact**: Internal Reconnaissance / SSRF\n- **KEV Status**: Not Listed\n\n## Affected Systems\n\n- Ghost Content Management System (Node.js)\n- **Ghost**: >= 0.10.0, < 6.54.1 (Fixed in: `6.54.1`)\n\n## Mitigation\n\n- Upgrade Ghost to version 6.54.1 or higher\n- Implement egress filtering to block outgoing traffic to private IP spaces and link-local ranges\n- Enforce IMDSv2 on AWS-hosted instances to protect metadata services from blind SSRF\n\n**Remediation Steps:**\n1. Identify current running Ghost instance version.\n2. Execute update commands through Ghost CLI: `ghost update 6.54.1`.\n3. Confirm the service is running the updated version: `ghost version`.\n4. Implement firewall egress rules (e.g., iptables) restricting the Ghost service user from connecting to localhost and private interfaces.\n\n## References\n\n- [GitHub Security Advisory GHSA-gcvv-72q8-9v76](https://github.com/TryGhost/Ghost/security/advisories/GHSA-gcvv-72q8-9v76)\n- [CVE-2026-70591 CVE Record](https://www.cve.org/CVERecord?id=CVE-2026-70591)\n\n\n---\n*Generated by [CVEReports](https://cvereports.com/reports/CVE-2026-70591) - Automated Vulnerability Intelligence*", "creation_timestamp": "2026-08-05T04:31:14.915597Z"}]}