CVE-2026-105644 TryGhost CVE debrief

Who should care

Defenders responsible for Ghost installations, particularly those using versions between 4.0.0 and 6.65.0, should assess exposure and prioritize updates to version 6.67.0 or later.

Why it matters

Defenders should care about CVE-2026-105644 because it allows an attacker to host scripts on the site's domain, potentially compromising staff users' admin sessions, and requires verification of content import sanitization.

• Possible compromise of staff users' admin sessions
• Hosting of scripts on the site's domain
• Verification of content import sanitization

Technical summary

The vulnerability is present in Ghost from version 4.0.0 up to version 6.65.0. An attacker who convinces an Administrator to import a crafted file could host scripts on the site's domain, possibly resulting in compromise of staff users' admin sessions. The fix is included in version 6.67.0. Defenders should prioritize updating Ghost installations to version 6.67.0 or later, and verify that content imports are properly sanitized. Ghost thanks Zhixi 'Jace' Sun, independent security researcher, for disclosing this vulnerability responsibly.

Defensive priority

Defenders should prioritize updating Ghost installations to version 6.67.0 or later, and verify that content imports are properly sanitized.

Recommended defensive actions

• Update Ghost installations to version 6.67.0 or later
• Verify that content imports are properly sanitized
• Monitor for suspicious activity on the site
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and source item provide details on a stored XSS vulnerability in Ghost, which allows an attacker to host scripts on the site's domain, potentially compromising staff users' admin sessions.

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.