CVE-2026-53946
MediumCVSS 5.4Exploitation Probability (EPSS)
Low risk2th percentile — higher than 2% of all known CVEs
Summary
Ghost is a Node.js content management system. From versions 6.19.4 to 6.21.1, when re-rendering posts, Ghost could send HTTP requests to unauthorized image hosts, posing a security risk.
Risk Assessment
The threat is that an authenticated user could direct a request to a malicious host, potentially exposing data from internal networks or cloud metadata endpoints.
Recommendation
It is recommended to update Ghost to version 6.21.1 to mitigate this vulnerability and restrict post editing access to trusted users.
Original NVD description (English source)
Ghost is a Node.js content management system. From 6.19.4 until 6.21.1, 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 fixed in 6.21.1.