CVE-2026-103276

MEDIUM 5.3

Ghost before 6.20.0 File Read via URL Encoding Bypass

CVSS Score

5.3

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-173
Vendor	tryghost
Product	ghost
Published	Oct 1, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

None

Affected Versions

TryGhost / Ghost

0 < 6.20.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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