Vulnerability · Published Oct 1, 2026 · Assigned by VulnCheck
CVE-2026-103276Ghost before 6.20.0 File Read via URL Encoding Bypass
Medium 5.3
In plain English
A medium-severity security flaw in Ghost from TryGhost. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 13% of all known vulnerabilities).
Severity (CVSS 3.1)5.3Medium
Exploit odds (30 days)0.2%top 86.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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.
Affected products (as reported)
Weakness: CWE-173 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
References
- GitHub Security Advisory (GHSA-6v8p-3jx9-8chr) vendor-advisory
- VulnCheck Advisory: Ghost before 6.20.0 File Read via URL Encoding Bypass third-party-advisory