# CVE-2026-53946: Ghost: Mobiledoc image-size fetch SSRF

> Authenticated staff users can trigger server-side requests to internal or metadata endpoints via crafted image URLs in Ghost CMS posts.

- **Severity:** Medium 5.4 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 24 Jun 2026
- **Updated:** 25 Jun 2026
- **Also known as:** BIT-ghost-2026-53946, GHSA-g366-23fw-ggp6

## What is CVE-2026-53946?

CVE-2026-53946 is a medium-severity server-side request forgery vulnerability in TryGhost Ghost, published on 24 Jun 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

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.

Weakness: CWE-918 (Server-Side Request Forgery)

## Which versions are affected by CVE-2026-53946?

3 open source packages ship an affected version, including ghost.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `ghost` | Bitnami | From 6.19.4 | 6.21.1 |
| `ghost` | npm | From 6.19.4 | 6.21.2 |
| `ghost` | npm | From 6.19.4 | 6.21.2 |

## How do I fix CVE-2026-53946?

Upgrade ghost to a fixed version for your release line: 6.21.1 or 6.21.2.

## Is CVE-2026-53946 being exploited?

There is no known exploitation of CVE-2026-53946 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-53946 and fix it if it is affected.

What it is: CVE-2026-53946 is a medium-severity server-side request forgery vulnerability in TryGhost Ghost, published on 24 Jun 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-53946 in the wild and no public exploit code.

Affected packages and fixed versions:
- ghost (Bitnami): affected from 6.19.4; fixed in 6.21.1
- ghost (npm): affected from 6.19.4; fixed in 6.21.2
- ghost (npm): affected from 6.19.4; fixed in 6.21.2

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-53946/ (Markdown: https://insights.sbomify.com/CVE-2026-53946/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-53946
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-53946
- OSV: https://osv.dev/vulnerability/CVE-2026-53946

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-53946/
Summaries are generated and may contain mistakes; the official description above is the record.