CVE-2026-103276

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.

CVSS Vector

References

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