Ghost versions before 6.20.0 contain a file extension filtering bypass vulnerability that allows unauthenticated attackers to read theme templates and metadata. Attackers can use URL encoding to bypass extension validation and access sensitive theme files.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact Low

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact Low

Integrity Impact None

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
TryGhost Ghost unaffected
Version Status Constraints
0 affected < 6.20.0
6.20.0 unaffected —

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Project Subscriptions

Vendors Products
Ghost Subscribe
Ghost Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/TryGhost/Ghost/security/advisories/GHSA-6v8p-3jx9-8chr cve-icon cve-icon
https://www.vulncheck.com/advisories/ghost-before-6.20.0-file-read-via-url-encoding-bypass cve-icon cve-icon
History

Thu, 01 Oct 2026 11:00:00 +0000

Type Values Removed Values Added
Description Ghost versions before 6.20.0 contain a file extension filtering bypass vulnerability that allows unauthenticated attackers to read theme templates and metadata. Attackers can use URL encoding to bypass extension validation and access sensitive theme files.
Title Ghost before 6.20.0 File Read via URL Encoding Bypass
First Time appeared Ghost
Ghost ghost
Weaknesses CWE-173
CPEs cpe:2.3:a:ghost:ghost:*:*:*:*:*:*:*:*
Vendors & Products Ghost
Ghost ghost
References
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N'}

cvssV4_0

{'score': 6.9, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-10-01T13:34:52.840Z

Reserved: 2026-09-30T10:59:00.638Z

Link: CVE-2026-103276

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-10-01T11:17:23.237

Modified: 2026-10-01T11:17:23.237

Link: CVE-2026-103276

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-01T13:15:08Z

Weaknesses