🛡️ CVE-2026-53945 — ghost

🟡 CVSS 5.0 — Medium ✅ No Known Exploit CWE-367 NVD
5.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Ghost: Server-side request forgery via DNS rebinding in external request handling

Impact

Ghost’s private-IP check for outbound HTTP requests could be bypassed via DNS rebinding, allowing an attacker to coerce the Ghost server into reaching hosts on internal networks through features that issue external fetches.

Vulnerable versions

This vulnerability is present in Ghost from v6.0.9 up to v6.21.0.

Patches

v6.21.1 contains a fix for this issue.

How to update

For self-hosters using Docker, find [Docker's official Ghost image here](https://hub.docker.com/_/ghost). Updating a Docker-based Ghost instance [is documented here](https://docs.ghost.org/install/docker#updating-ghost).

If your Ghost is a Ghost-CLI install see our documentation on [updating it to the latest version here](https://docs.ghost.org/update).

Workarounds

If upgrading immediately is not possible, operators can reduce exposure by preventing the Ghost server from reaching sensitive internal ranges at the network layer — for example, egress firewall rules that block the Ghost process from initiating connections to RFC1918 networks, loopback, link-local (including 169.254.169.254) and any other internal service ranges. Disabling features that trigger outbound fetches (oEmbed, webmentions, recommendations) will further limit the attack surface but does not remove the underlying issue.

References

Ghost thanks Oluwaseun Esther Folorunsho, Lakshmikanthan K ([@l3tchupkt](https://github.com/l3tchupkt)), [Offgrid Security](https://www.offgridsec.com/), and Baki for disclosing this vulnerability responsibly.

For more information

If you have any questions or comments about this advisory, email us at [[email protected]](mailto:[email protected]).

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is high, an attacker needs no privileges on the target. No user interaction is required. The scope is changed, meaning a successful attack can affect components beyond the vulnerable one. Rated impact: confidentiality none, integrity low, availability none.

Weakness class

CVE-2026-53945 is classified as CWE-367: Time-of-check Time-of-use Race Condition. The state checked and the state acted upon can differ, because it may change between the two steps.

Affected software

CVE-2026-53945 is recorded against 2 packages.

  • ghost
  • unknown

Timeline and source

Published on 30 June 2026 and last revised on 4 August 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

github.com (Web)
nvd.nist.gov (Web)

Details

Severity MEDIUM
CVSS Score 5.0
CVSS Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N
CWE CWE-367
Public Exploit ✅ No
Source NVD
Published 2026-06-30
Updated 2026-08-12
Modified 2026-08-04
Fix URL N/A

Affected Packages

Software From version Fixed in
ghost — —
unknown — —

Similar Threats

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