Quick answers
- Is CVE-2026-103291 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-103291 being exploited in the wild.
- How severe is CVE-2026-103291?
- Medium severity, with a CVSS score of 6.4, published 1 October 2026.
- Which products and versions are affected?
- TryGhost Ghost 3.20.2 to before 6.51.0.
- Is there a fix for CVE-2026-103291?
- Yes: fixed in 6.51.0. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-103291 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-103291?
- Check whether you run TryGhost Ghost at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
How to fix
- Fixed in: 6.51.0
Technical details
A server-side request forgery (SSRF) vulnerability exists in Ghost's image dimension refetching logic. When re-rendering posts, Ghost fetches missing image dimensions by issuing HTTP requests to URLs stored in image cards without validating that the URLs point to trusted hosts. An authenticated staff user can create or edit posts to point image cards at attacker-controlled servers or internal endpoints (cloud metadata, internal services) to trigger requests from the Ghost server itself.
Affected products
- TryGhost Ghost 3.20.2 to before 6.51.0
Timeline
- 2026-09-09: disclosed
- 2026-10-01: advisory