{"id":"CVE-2026-103276","title":"Ghost versions before 6.20.0 contain a file extension filtering bypass vulnerability that allows unauthenticated attackers to read theme templates and metadata","summary":"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 sen…","severity":"medium","cvss":5.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","cwe":["CWE-173"],"vendor":"TryGhost","product":"Ghost","affected":["Ghost < 6.20.0"],"published":"2026-10-01","updated":"2026-10-01","sourceUpdated":"2026-10-01T11:17:23.237","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-103276","references":[{"url":"https://github.com/TryGhost/Ghost/security/advisories/GHSA-6v8p-3jx9-8chr","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/ghost-before-6.20.0-file-read-via-url-encoding-bypass","label":"disclosure@vulncheck.com"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-10-01T11:42:53.810Z","ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-10-01T13:34:31.162544Z"},"slug":"CVE-2026-103276","body":"## Overview\n\nGhost 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":29,"depthScoreParts":{"impact":29.2,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}