Incomplete List of Disallowed Inputs Affecting ghost package, versions >=6.0.9 <6.21.2
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JS-GHOST-17823150
- published6 Jul 2026
- disclosed24 Jun 2026
- creditl3tchupkt
Introduced: 24 Jun 2026
NewCVE-2026-53944 (opens in a new tab)How to fix?
Upgrade ghost to version 6.21.2 or higher.
Overview
ghost is a publishing platform
Affected versions of this package are vulnerable to Incomplete List of Disallowed Inputs through the isPrivateIp logic in core/server/lib/request-external.js. An attacker can make Ghost send server-side requests to internal services by supplying an external URL that uses an IPv6 literal mapping to a private IPv4 address, such as an expanded IPv4-mapped form that slips past the private-IP check. This lets an attacker reach loopback, link-local, or RFC1918 targets from Ghost’s outbound request handling, exposing internal network services to SSRF-style access and letting the attacker trigger requests against resources the application was meant to block.