{"affected":[{"defaultStatus":"unaffected","platforms":["Default"],"product":"Fireware OS","source":"CNA: WatchGuard","vendor":"WatchGuard","versions":[{"lessThan":"2026.4","status":"affected","version":"2025.1","versionType":"custom"},{"lessThan":"12.12.4","status":"affected","version":"12.0","versionType":"custom"}]},{"defaultStatus":"unaffected","platforms":["T15/T35"],"product":"Fireware OS","source":"CNA: WatchGuard","vendor":"WatchGuard","versions":[{"lessThan":"12.5.22","status":"affected","version":"12.0","versionType":"custom"}]}],"cveId":"CVE-2026-93866","cwes":["CWE-190","CWE-288","CWE-787"],"description":"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.","epss":{"date":"2026-11-04","percentile":0.43592,"score":0.00509},"exploits":[],"kev":null,"metrics":[{"score":9.2,"severity":"critical","source":"CNA: WatchGuard","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","version":"4.0"}],"modifiedAt":1793824011215,"publishedAt":1793116347871,"references":[{"source":"CNA: WatchGuard","tags":["vendor-advisory"],"url":"https://psirt.watchguard.com/CVE-2026-93866"}],"remediation":[{"kind":"fix","source":"CNA: WatchGuard","text":"Fireware OS 2026.4, Fireware OS 12.12.4, Fireware OS 12.5.22"}],"revision":"ad3b07318efc0a4cd5f4f49c8cf14d658d978e3bbc6993c41270ed53c266eef0","sources":[{"modifiedAt":1793824011215,"name":"CNA: WatchGuard","retrievedAt":1793826778123,"url":"https://www.cve.org/CVERecord?id=CVE-2026-93866"},{"modifiedAt":null,"name":"FIRST EPSS","retrievedAt":1793826781873,"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-93866"}],"ssvc":{"assessedAt":1793817957731,"automatable":"no","exploitation":"none","source":"ADP: CISA-ADP","technicalImpact":"total"},"status":"published","title":"Fireware OS Pre-Authentication Integer Overflow in Access Portal Allows Out-of-Bounds Write","updatedAt":1793826781873}