CVE-2026-53946Medium· 5.4▾ SunlitGhost: Mobiledoc image-size fetch SSRF
▾ Sunlit zone — Low / medium · no exploitation signal
impact 29.7 · likelihood 0 · exploitation 0
Need a working PoC? Pro members can cast a request and our team develops one — it lands right here.
Exploit-prediction probability, daily snapshots since Aug 4.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via GHSA
0.1%
0.1% → 0.2%
When re-rendering posts, Ghost would refetch missing image dimensions by issuing an outbound HTTP request to the URL stored on an image card — without restricting that URL to trusted image hosts. An authenticated staff user able to create or edit posts could therefore point an image card at an attacker-chosen host and cause the Ghost server to request it on their behalf, including hosts on internal networks or cloud instance metadata endpoints that would not normally be reachable from the public internet.
This vulnerability is present in Ghost from v6.19.3 up to v6.21.0.
v6.21.1 contains a fix for this issue.
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.
If you have any questions or comments about this advisory, email us at [email protected].
ghost >= 6.19.4, < 6.21.1Upgrade to a patched release:
ghost 6.21.2Connected by shared product, vendor, weakness, or advisory.
CVE-2026-53944Medium· 5.8Ghost: Private IP filtering bypass to make server-side requests to internal services
CVE-2026-53945Medium· 4.0Ghost: Server-side request forgery via DNS rebinding in external request handling
CVE-2026-70595Medium· 4.0Ghost is a Node.js content management system
CVE-2026-53947Medium· 5.3Ghost: Member existence leak via magic link sign-in response
CVE-2026-53948Medium· 5.4Ghost: File Upload Content-Type Spoofing
CVE-2026-70591Medium· 4.1Ghost is a Node.js content management system