EUVD-2026-53388
GHSA-x5mm-wm4g-j5xv
Severity by source
AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N
Network-accessible unauthenticated feature; S:C for internal network boundary crossing; C:L for blind probe-only SSRF; no integrity or availability impact; AC:H consistent with vendor-assigned vector and blind exploitation constraint.
Primary rating from Vendor (https://github.com/TryGhost/Ghost).
CVSS VectorVendor: https://github.com/TryGhost/Ghost
Lifecycle Timeline
3DescriptionCVE.org
Impact
A validation issue allowed some functionality, such as Webmentions, to be abused by an unauthenticated user to make limited HTTP requests to hosts in the Ghost server's internal network. A successful attack would not result in any response data being returned.
Vulnerable versions
This vulnerability is present in Ghost from v6.26.0 up to v6.54.0.
Patches
v6.54.1 contains a fix for this issue.
How to update
For self-hosters using Docker, find Docker's official Ghost image here. Updating a Docker-based Ghost instance is documented here.
If your Ghost is a Ghost-CLI install see our documentation on updating it to the latest version here.
References
Ghost thanks Hwang Seyeon for disclosing this vulnerability responsibly.
For more information
If you have any questions or comments about this advisory, email Ghost at [security@ghost.org](mailto:security@ghost.org).
AnalysisAI
Server-Side Request Forgery in Ghost CMS v6.26.0-v6.54.0 allows unauthenticated remote attackers to abuse features such as Webmentions to issue blind HTTP requests from the Ghost server into its internal network, bypassing perimeter controls without returning response content to the attacker. The flaw stems from insufficient URL validation in outbound HTTP request handling, enabling internal host probing across a changed security scope (CVSS S:C). …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a Ghost instance running v6.26.0 through v6.54.0 with at least one outbound-HTTP-making feature active (Webmentions confirmed; other features may also be vulnerable per the advisory). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The vendor-assigned CVSS 3.1 score of 4.0 (Medium) reflects network reachability (AV:N) and zero authentication/interaction requirements (PR:N, UI:N), but is moderated by high attack complexity (AC:H) and limited confidentiality impact (C:L) with no integrity or availability impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade Ghost to v6.54.1 or later, which contains the vendor-confirmed validation fix for this issue. … Detailed patch versions, workarounds, and compensating controls in full report. |
Threat intelligence, references, and detailed analysis are available after sign-in.
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External POC / Exploit Code
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