EUVD-2026-52977
GHSA-cjc9-q5gf-327p
Severity by source
AV:N/AC:H/PR:H/UI:N/S:C/C:N/I:H/A:L
AC:L chosen over vendor AC:H because crafting a path-traversal theme name is straightforward with no attacker-uncontrollable conditions; PR:H retained as staff authentication is required; S:C reflects writes escaping the uploads directory boundary.
Primary rating from Vendor (https://github.com/TryGhost/Ghost).
CVSS VectorVendor: https://github.com/TryGhost/Ghost
Lifecycle Timeline
2DescriptionCVE.org
Impact
A vulnerability in custom themes allowed a staff user to write files outside of the uploads directory. This could be used to alter the behavior of the installation.
Vulnerable versions
This vulnerability is present in Ghost from v0.10.0 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 Stephen Sims, Off By One Security 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
Path traversal in Ghost CMS theme upload (CWE-22) allows an authenticated staff-level user to write arbitrary files outside the designated uploads directory, potentially altering the behavior of the entire Ghost installation. Affected versions span v0.10.0 through v6.54.0 of the npm/ghost package - a wide range covering essentially all modern deployments. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an active, authenticated Ghost staff-level session (CVSS PR:H) - unauthenticated and subscriber-level users cannot upload themes. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS vector (AV:N/AC:H/PR:H/UI:N/S:C/C:N/I:H/A:L, score 6.6) correctly reflects that exploitation is gated behind staff-level authentication (PR:H) and describes the impact as Scope:Changed - indicating that file writes escape the theme storage component and can affect the broader Ghost installation. … 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 complete fix (commit fbaa92327e52607036a1e42204c9eadcc751d82c). … 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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Same weakness CWE-22 – Path Traversal
View allSame technique Path Traversal
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External POC / Exploit Code
Leaving vuln.today