# CVE-2026-105648: Ghost SSRF validation issue in Webmentions

Source: https://junglewise.ai/threats/cve-2026-105648-ghost-is-a-node-js-content-management-system-from-6-0-9-until-6  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-05. Updated: 2026-10-05  
License: CC BY 4.0 with a link back

CVE-2026-105648 · Severity: medium · CVSS 4 · Published 2026-10-05

Ghost is a Node.js content management system used to build publishing platforms. A validation weakness in features like Webmentions allows unauthenticated attackers to make limited HTTP requests to internal network hosts that the Ghost server can reach, potentially exposing internal services or infrastructure. While responses are not returned to the attacker, this enables internal network reconnaissance and denial-of-service attacks against internal systems.

Technologies: [Ghost](https://junglewise.ai/threats/technologies/ghost-ghost), [ghost (npm)](https://junglewise.ai/threats/technologies/ghost). Vendors: [Ghost](https://junglewise.ai/threats/vendors/ghost), [npm](https://junglewise.ai/threats/vendors/npm).

## Quick answers

**Is CVE-2026-105648 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-105648 being exploited in the wild.

**How severe is CVE-2026-105648?** Medium severity, with a CVSS score of 4, published 5 October 2026.

**Which products and versions are affected?** Ghost 6.0.9 to 6.65.0; ghost (npm) >= 6.0.9, < 6.65.0, SEMVER:introduced=6.0.9,fixed=6.65.0.

**Is there a fix for CVE-2026-105648?** Yes. ghost (npm): upgrade to 6.65.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-105648 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-105648?** Check whether you run Ghost or ghost (npm) 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

- ghost (npm): upgrade to 6.65.0 or later

  ```sh
  npm install ghost@6.65.0
  ```


## Technical details

A validation issue in external request handling (Webmentions and similar functionality) fails to properly restrict HTTP requests to internal IP addresses and private networks, allowing unauthenticated attackers to initiate requests to internal network hosts via SSRF (Server-Side Request Forgery). The vulnerability affects versions 6.0.9 through 6.65.0 and is fixed by improved IP validation logic using ipaddr.js to properly detect and block private/internal addresses.

## Affected products

- Ghost Ghost 6.0.9 to 6.65.0

## Identifiers

- CVE-2026-105648
- GHSA-r7f2-6fj8-6fg2

## Timeline

- 2026-09-21: patched: Fix merged via commit 20d3f792bf4a7c349ee56b746a067550d8684ff5 simplifying external request IP validation logic
- 2026-10-05: disclosed: Vulnerability disclosed via CVE-2026-105648

## References

- [https://github.com/TryGhost/Ghost/commit/20d3f792bf4a7c349ee56b746a067550d8684ff5](https://github.com/TryGhost/Ghost/commit/20d3f792bf4a7c349ee56b746a067550d8684ff5)
- [https://github.com/TryGhost/Ghost/pull/30917](https://github.com/TryGhost/Ghost/pull/30917)

## Related threats

- [Ghost: Path Traversal Vulnerability in Ghost ImageSize Service](https://junglewise.ai/threats/cve-2026-105683-ghost-is-a-node-js-content-management-system-from-6-14-0-until-6)
- [Ghost: Server-Side Request Forgery in Webhook Trigger](https://junglewise.ai/threats/cve-2026-105682-ghost-is-a-node-js-content-management-system-from-1-18-0-until-6)
- [Ghost input validation bypass in comments access control](https://junglewise.ai/threats/cve-2026-105681-ghost-is-a-node-js-content-management-system-from-5-9-0-until-6)
- [Ghost authorization bypass in post deletion](https://junglewise.ai/threats/cve-2026-105680-ghost-is-a-node-js-content-management-system-from-5-81-0-until-6)
- [Ghost content type validation bypass in local file storage](https://junglewise.ai/threats/cve-2026-105679-ghost-is-a-node-js-content-management-system-from-6-22-1-until-6)