{"items":[{"id":"NVI-00017542","kind":"vulnerability","title":"Ghost: Cache-poisoning XSS in Ghost frontend via x-ghost-preview header","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-62q6-4hv4-vjrw","CVE-2026-53943"],"plain_summary":"GitHub lists this reviewed advisory for ghost. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-193b9efa1c6b5e124215a3bc67eaccd5"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"CVSS","as_of":"2026-07-01T21:58:34.000Z","value":"9.6 critical","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-193b9efa1c6b5e124215a3bc67eaccd5"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-193b9efa1c6b5e124215a3bc67eaccd5","url":"https://github.com/advisories/GHSA-62q6-4hv4-vjrw","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-62q6-4hv4-vjrw","publisher":"GitHub Advisory Database","observed_at":"2026-11-05T03:47:42.887Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-193b9efa1c6b5e124215a3bc67eaccd5"],"technology":"ghost","known_exclusions":[],"conditions_summary":"### Impact\n\nWhen Ghost is behind a shared caching layer that results in cached content being shared between different visitors (e.g., Fastly, Cloudflare, nginx proxy_cache, and others), an unauthenticated user could send an `x-ghost-preview` header that altered the rendered frontend response. In affected cache configurations, that response could be stored and served to subsequent visitors requesting the same page, allowing cache poisoning of request-specific preview output. \n\nWhen running Ghost's frontend and admin panel on the same domain this could be used to take over staff user accounts. When running these on different domains staff accounts have no exposure. \n\n### Vulnerable versions\n\nThis vulnerability is present in Ghost from v4.0 up to v6.36.0.\n\n### Patches\n\nv6.37.0 contains a fix for this issue.\n\n### How to update\n\nFor self-hosters using Docker, find Docker's official Ghost image here. Updating a Docker-based Ghost instance is documented here.\n\nIf your Ghost is a Ghost-CLI install see our documentation on updating it to the latest version here.\n\nIf you","public_affected_ranges":[">= 4.0.0, <= 6.36.0"]}],"null_published_at":"2026-11-05T19:10:21.409Z","source_updated_at":"2026-07-01T21:58:34.000Z","source_disclosed_at":"2026-07-01T21:58:32.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"First indexed by Null; source disclosure date is shown separately.","null_first_observed_at":"2026-11-05T03:47:42.887Z"}],"next_cursor":null,"snapshot_revision":"42594"}