All vulnerabilities
CVE-2026-103276GHSA-6v8p-3jx9-8chr

Ghost before 6.20.0 File Read via URL Encoding Bypass

TryGhost GhostApplications & CMS
Open in ThreatlineRecord JSON
CVSS
6.9Medium
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.23%Chance of exploitation activity in the next 30 days, higher than 12% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in6.20.0Fixed versionCVE List
Published1 Oct 2026Updated 1 Oct 2026CVE List

What fixes it

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

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.

Text from CVE List

Affected versions 2

  • Ghostaffected: all versions before 6.20.0CVE List
  • Ghostunaffected: 6.20.0CVE List

References 2