CVE-2026-103276 Ghost before 6.20.0 File Read via URL Encoding Bypass
Unauthenticated attackers can bypass file extension filters using URL encoding to read sensitive theme templates and metadata in Ghost CMS.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-103276?
CVE-2026-103276 is a medium-severity path traversal vulnerability in TryGhost Ghost, published on 1 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
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.
Weakness: CWE-173
Which versions are affected by CVE-2026-103276?
1 open source package ship an affected version, including ghost.
| Package | Affected | Fixed in |
|---|---|---|
ghost Bitnami | All versions | 6.20.0 |
How do I fix CVE-2026-103276?
Upgrade ghost to 6.20.0 or later.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-103276 being exploited?
There is no known exploitation of CVE-2026-103276 in the wild and no public exploit code.
Sources
Also known as BIT-ghost-2026-103276, GHSA-6v8p-3jx9-8chr, GHSA-v575-g66p-vj84.