CVE-2026-103290 TryGhost CVE debrief

Who should care

Defenders responsible for Ghost installations, particularly those using versions between 6.14.0 and 6.27.0, should assess exposure and prioritize updates to prevent potential unauthorized access to sensitive files.

Why it matters

CVE-2026-103290 is a path traversal vulnerability in Ghost ImageSize Service that may allow staff users to access local files outside intended data storage directories. Defenders should prioritize updates to version 6.27.0 or later and verify staff user access controls to prevent potential unauthorized access.

• Potential unauthorized access to sensitive files outside intended data storage directories
• Possible data exposure or integrity issues if staff users have access to sensitive files
• Need for verification of staff user access controls and file system permissions
• Priority for updating Ghost instances to version 6.27.0 or later

Technical summary

A path traversal vulnerability in Ghost ImageSize Service may allow staff users to access local files outside intended data storage directories on the server. The vulnerability affects Ghost versions from 6.14.0 to 6.27.0 and is fixed in version 6.27.0. Defenders should prioritize updating Ghost instances to version 6.27.0 or later and verify that staff users do not have access to sensitive files outside intended data storage directories. The vulnerability has a significant impact on the security of Ghost installations, and defenders should take immediate action to update affected systems.

Defensive priority

Defenders should prioritize updating Ghost instances to version 6.27.0 or later, and verify that staff users do not have access to sensitive files outside intended data storage directories.

Recommended defensive actions

• Update Ghost instances to version 6.27.0 or later
• Verify staff users do not have access to sensitive files outside intended data storage directories
• Review and update access controls for Ghost installations
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed
• Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE record and osv_dev source item provide details on the path traversal vulnerability in Ghost ImageSize Service, affecting versions from 6.14.0 to 6.27.0. The vulnerability allows staff users to access local files outside intended data storage directories. Defenders should verify staff user access controls and file system permissions to prevent potential unauthorized access. The CVE Program and osv_dev source item provide evidence of the vulnerability, but the exact scope and impact are limited by the information available. Defs

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.