{"metadata": {"vulnerability": "CVE-2026-18551", "count": 13, "kinds": {"milestone": 4, "sighting": 1, "kev": 0, "other": 8}}, "data": [{"timestamp": "2026-07-31T23:37:44.233Z", "date_only": false, "value": "2026-07-31T23:37:44.233Z", "kind": "milestone", "label": "Reserved", "source": "cvelistv5", "record": "CVE-2026-18551", "field": "cveMetadata.dateReserved"}, {"timestamp": "2026-10-16T06:56:51.996Z", "date_only": false, "value": "2026-10-16T06:56:51.996Z", "kind": "milestone", "label": "Published", "source": "cvelistv5", "record": "CVE-2026-18551", "field": "cveMetadata.datePublished", "metric_role": "disclosure", "metric_basis": "recorded_event"}, {"timestamp": "2026-10-16T06:56:51.996Z", "date_only": false, "value": "2026-10-16T06:56:51.996Z", "kind": "other", "label": "Updated", "source": "cvelistv5 / Mattermost", "record": "CVE-2026-18551", "field": "containers.cna.providerMetadata.dateUpdated"}, {"timestamp": "2026-10-16T07:17:12Z", "date_only": false, "value": "2026-10-16T07:17:12Z", "kind": "other", "label": "Nvd published at", "source": "github \u00b7 GHSA-RH7P-PP3Q-6CF8", "record": "GHSA-RH7P-PP3Q-6CF8", "field": "database_specific.nvd_published_at"}, {"timestamp": "2026-10-16T07:17:12.260Z", "date_only": false, "value": "2026-10-16T07:17:12.260", "kind": "milestone", "label": "Published", "source": "fkie_nvd \u00b7 FKIE_CVE-2026-18551", "record": "FKIE_CVE-2026-18551", "field": "published", "metric_role": "disclosure", "metric_basis": "recorded_event"}, {"timestamp": "2026-10-16T08:00:19.811Z", "date_only": false, "value": "2026-10-16T08:00:19.811122Z", "kind": "sighting", "label": "Seen", "source": "https://infosec.exchange/users/cve/statuses/117449531019291965", "record": "CVE-2026-18551", "field": "creation_timestamp", "uuid": "9e9fc543-b377-4f9f-8919-d29869fdf406", "content": "CVE-2026-18551 Mattermost guest account privilege escalation via member roles API Mattermost versions 11.10.x <= 11.10.0, 11.7.x <= 11.7.9, 11.9.x <= 11.9.1, 11.8.x <= 11.8.5 fail to validate the combination of guest and admin scheme roles which allows an authenticated attacker to escalate a guest account to team or channel admin via a crafted PUT request to the member roles API endpoint.. 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