{"schema":"threatline.record/2","record":{"id":"CVE-2026-93866","aliases":[],"summary":"Fireware OS Pre-Authentication Integer Overflow in Access Portal Allows Out-of-Bounds Write","details":"An integer overflow vulnerability in the WebSocket connection handling used by WatchGuard Fireware OS's Access Portal allows a remote, unauthenticated attacker to write beyond the bounds of a heap buffer by sending a specially crafted request while the Access Portal feature is enabled.","categories":["Network & edge"],"product":"Fireware OS","vendor":"WatchGuard","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-93866","source_modified_at":"2026-10-27T15:52:27.871Z","fetched_at":"2026-10-27T16:27:21.584480Z","product":"Fireware OS","vendor":"WatchGuard","versions":[{"status":"affected","version":"2025.1","versionType":"custom","lessThan":"2026.4"},{"status":"affected","version":"12.0","versionType":"custom","lessThan":"12.12.4"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-93866","source_modified_at":"2026-10-27T15:52:27.871Z","fetched_at":"2026-10-27T16:27:21.584480Z","product":"Fireware OS","vendor":"WatchGuard","versions":[{"status":"affected","version":"12.0","versionType":"custom","lessThan":"12.5.22"}],"defaultStatus":"unaffected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-93866","source_modified_at":"2026-10-27T15:52:27.871Z","fetched_at":"2026-10-27T16:27:21.584480Z","package":{"name":"Fireware OS","ecosystem":null},"version":"2026.4","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-93866","source_modified_at":"2026-10-27T15:52:27.871Z","fetched_at":"2026-10-27T16:27:21.584480Z","package":{"name":"Fireware OS","ecosystem":null},"version":"12.12.4","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-93866","source_modified_at":"2026-10-27T15:52:27.871Z","fetched_at":"2026-10-27T16:27:21.584480Z","package":{"name":"Fireware OS","ecosystem":null},"version":"12.5.22","basis":"first unaffected version stated in the CVE record"}],"cvss":9.2,"severity":"Critical","kev":{"listed":false},"epss":{"probability":null,"percentile":null,"score_date":null},"published_at":"2026-10-27T15:52:27.871Z","modified_at":"2026-10-27T15:52:27.871Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-93866","fetched_at":"2026-10-27T16:27:21.584480Z","source_modified_at":"2026-10-27T15:52:27.871Z"}],"sources":["CVE List"],"references":[{"source":"CVE List","url":"https://psirt.watchguard.com/CVE-2026-93866","tags":["vendor-advisory"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"vendor and product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-27T15:52:27.871Z","content_hash":"e0cfff1c3a040a460d6ebb89c4266726aaa4ec60cd376e092aead75c87cb86f7"}}