Ghost: Cache-poisoning XSS in Ghost frontend via x-ghost-preview header

Date Jul 1, 2026

Type Vendor advisory

Signal High-risk advisory

Vendor / Product npm · ghost

CVE CVE-2026-53943

High-risk advisory CVE-2026-53943

Summary

Ghost: Cache-poisoning XSS in Ghost frontend via x-ghost-preview header

Why it matters

GitHub has published a reviewed security advisory for ghost. Prioritize it with other application dependency updates, especially because EPSS places it in the 16% percentile.

Operator check

Check whether ghost is present in application dependency manifests, lockfiles, or build images. Review the GitHub advisory and upgrade to a patched version where available. EPSS probability: 0.2%; percentile: 16%.

Sources

GitHub Advisory GHSA-62q6-4hv4-vjrw NVD — CVE-2026-53943 Source reference

PatchBrief uses public sources. It does not scan environments, verify exposure, or replace vendor guidance.

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