CVE-2026-103276

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 sensitive theme files.

Affected Software

Weaknesses

• CWE-173: Improper Handling of Alternate Encoding

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: yes
  • Technical Impact: partial

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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