{"cve":{"cve_id":"CVE-2026-104286","is_kev":true,"kev_date_added":"2026-10-01","kev_vendor_project":"Fortinet","kev_product":"FortiMail","kev_vulnerability_name":"Fortinet FortiMail Path Traversal Vulnerability","kev_short_description":"Fortinet FortiMail contains a path traversal and an improper neutralization of NULL byte or NULL character vulnerability that may allow an unauthenticated attacker to write arbitrary files on the underlying system via crafted HTTP or HTTPS requests.","kev_required_action":"Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.","kev_due_date":"2026-10-04","kev_known_ransomware":false,"kev_notes":"https://fortiguard.fortinet.com/psirt/FG-IR-26-175 ; ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-104286","kev_cwes":["CWE-22","CWE-158"],"epss_score":0.02201,"epss_percentile":0.82187,"epss_as_of":"2026-10-15","description":"An improper limitation of a pathname to a restricted directory ('path traversal') vulnerability in Fortinet FortiMail 8.0.0 through 8.0.1, FortiMail 7.6.0 through 7.6.6, FortiMail 7.4.0 through 7.4.8, FortiMail 7.2.0 through 7.2.9 may allow an unauthenticated attacker to write arbitrary files on the underlying system via crafted HTTP or HTTPS requests.","published_at":"2026-10-01T19:17:38.938000Z","last_modified_at":"2026-10-07T18:17:15.240000Z","cvss_v3_score":9.8,"cvss_v3_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C","cvss_v3_severity":"CRITICAL","cvss_v4_score":null,"cvss_v4_vector":null,"cvss_v4_severity":null,"ssvc_decision":null,"ssvc_exploitation":null,"ssvc_automatable":null,"ssvc_technical_impact":null,"cwes":["CWE-22"],"nvd_references":["https://fortiguard.fortinet.com/psirt/FG-IR-26-175"],"vuln_status":"Analyzed","trending_score":null,"is_trending":false,"has_trended":false,"trended_number_one":false,"trending_peak_score":null,"trending_peak_rank":null,"started_trending_at":null,"trended_number_one_at":null,"summary_generated":null,"summary_generated_at":null,"summary_model":null,"created_at":"2026-10-01T19:38:54.209784Z","updated_at":"2026-10-08T22:04:58.430860Z"},"effective_severity":"CRITICAL","badges":["kev","news"],"impact_analysis":[],"cvss_v3_decoded":{"version":"3.1","metrics":[{"metric":"AV","name":"Attack 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Interaction","value":"N","value_label":"None"},{"metric":"S","name":"Scope","value":"U","value_label":"Unchanged"},{"metric":"C","name":"Confidentiality","value":"H","value_label":"High"},{"metric":"I","name":"Integrity","value":"H","value_label":"High"},{"metric":"A","name":"Availability","value":"H","value_label":"High"},{"metric":"E","name":"E","value":"P","value_label":"Physical"},{"metric":"RL","name":"RL","value":"O","value_label":"O"},{"metric":"RC","name":"RC","value":"C","value_label":"Changed"}]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"fortinet","vendor_name":"fortinet","product_slug":"fortimail","product_name":"fortimail","version_start":"8.0.0","version_start_inclusive":true,"version_end":"8.0.0","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:a:fortinet:fortimail:8.0.0:*:*:*:*:*:*:*"},{"vendor_slug":"fortinet","vendor_name":"fortinet","product_slug":"fortimail","product_name":"fortimail","version_start":"7.6.5","version_start_inclusive":true,"version_end":"7.6.5","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:a:fortinet:fortimail:7.6.5:*:*:*:*:*:*:*"},{"vendor_slug":"fortinet","vendor_name":"fortinet","product_slug":"fortimail","product_name":"fortimail","version_start":"7.6.4","version_start_inclusive":true,"version_end":"7.6.4","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:a:fortinet:fortimail:7.6.4:*:*:*:*:*:*:*"},{"vendor_slug":"fortinet","vendor_name":"fortinet","product_slug":"fortimail","product_name":"fortimail","version_start":"7.6.3","version_start_inclusive":true,"version_end":"7.6.3","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:a:fortinet:fortimail:7.6.3:*:*:*:*:*:*:*"},{"vendor_slug":"fortinet","vendor_name":"fortinet","product_slug":"fortimail","product_name":"fortimail","version_start":"7.6.2","version_start_inclusive":true,"version_end":"7.6.2","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:a:fortinet:fortimail:7.6.2:*:*:*:*:*:*:*"},{"vendor_slug":"fortinet","vendor_name":"fortinet","product_slug":"fortimail","product_name":"fortimail","version_start":"7.6.1","version_start_inclusive":true,"version_end":"7.6.1","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:a:fortinet:fortimail:7.6.1:*:*:*:*:*:*:*"},{"vendor_slug":"fortinet","vendor_name":"fortinet","product_slug":"fortimail","product_name":"fortimail","version_start":"7.6.0","version_start_inclusive":true,"version_end":"7.6.0","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:a:fortinet:fortimail:7.6.0:*:*:*:*:*:*:*"},{"vendor_slug":"fortinet","vendor_name":"fortinet","product_slug":"fortimail","product_name":"fortimail","version_start":"7.4.6","version_start_inclusive":true,"version_end":"7.4.6","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:a:fortinet:fortimail:7.4.6:*:*:*:*:*:*:*"},{"vendor_slug":"fortinet","vendor_name":"fortinet","product_slug":"fortimail","product_name":"fortimail","version_start":"7.4.5","version_start_inclusive":true,"version_end":"7.4.5","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:a:fortinet:fortimail:7.4.5:*:*:*:*:*:*:*"},{"vendor_slug":"fortinet","vendor_name":"fortinet","product_slug":"fortimail","product_name":"fortimail","version_start":"7.4.4","version_start_inclusive":true,"version_end":"7.4.4","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:a:fortinet:fortimail:7.4.4:*:*:*:*:*:*:*"},{"vendor_slug":"fortinet","vendor_name":"fortinet","product_slug":"fortimail","product_name":"fortimail","version_start":"7.4.3","version_start_inclusive":true,"version_end":"7.4.3","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:a:fortinet:fortimail:7.4.3:*:*:*:*:*:*:*"},{"vendor_slug":"fortinet","vendor_name":"fortinet","product_slug":"fortimail","product_name":"fortimail","version_start":"7.4.2","version_start_inclusive":true,"version_end":"7.4.2","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:a:fortinet:fortimail:7.4.2:*:*:*:*:*:*:*"},{"vendor_slug":"fortinet","vendor_name":"fortinet","product_slug":"fortimail","product_name":"fortimail","version_start":"7.4.1","version_start_inclusive":true,"version_end":"7.4.1","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:a:fortinet:fortimail:7.4.1:*:*:*:*:*:*:*"},{"vendor_slug":"fortinet","vendor_name":"fortinet","product_slug":"fortimail","product_name":"fortimail","version_start":"7.4.0","version_start_inclusive":true,"version_end":"7.4.0","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:a:fortinet:fortimail:7.4.0:*:*:*:*:*:*:*"},{"vendor_slug":"fortinet","vendor_name":"fortinet","product_slug":"fortimail","product_name":"fortimail","version_start":"7.2.9","version_start_inclusive":true,"version_end":"7.2.9","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:a:fortinet:fortimail:7.2.9:*:*:*:*:*:*:*"},{"vendor_slug":"fortinet","vendor_name":"fortinet","product_slug":"fortimail","product_name":"fortimail","version_start":"7.2.8","version_start_inclusive":true,"version_end":"7.2.8","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:a:fortinet:fortimail:7.2.8:*:*:*:*:*:*:*"},{"vendor_slug":"fortinet","v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"product_name":"fortimail","version_start":"7.2.0","version_start_inclusive":true,"version_end":"7.4.8","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:a:fortinet:fortimail:*:*:*:*:*:*:*:*"}],"exploit_refs":[],"news":[{"id":2303,"source":"The Hacker News","url":"https://thehackernews.com/2026/10/critical-fortimail-zero-day-flaw.html","title":"Critical FortiMail Zero-Day Flaw Exploited in Attacks Allows Unauthenticated Arbitrary File Writes","summary":"The U.S. Cybersecurity and Infrastructure Security Agency (CISA), on Thursday, added a critical security flaw impacting Fortinet FortiMail to its Known Exploited Vulnerabilities (KEV) catalog, following reports of active exploitation.\n\nThe vulnerability, tracked as CVE-2026-104286 (CVSS score: 9.8), allows unauthenticated attackers to write arbitrary files on the underlying system.\n\n\"An improper","thumbnail_url":"https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhhcZguz-U3FsSD6t4YQ45EeFbgnWAy9lM28OAFydsLXZYzOS00aOD7pxUZcgvLMfMAO3SJV_Amu9SoNezLNQOvx823Z92CpqC5ow9XO3d7HJhEKZlwQt4H4Z7kirDwGcSrUyi1ONs_PuULNYjEjzae2c1mncDviOT9iqxD-PhmXCYpulTUNO2rtW5c9AAx/s1600/fortimail.jpg","author":"info@thehackernews.com (The Hacker News)","published_at":"2026-10-02T05:49:50Z","fetched_at":"2026-10-02T06:21:54.510706Z","trending_score":0.00026298123885875745,"cve_ids":["CVE-2026-104286"]},{"id":2302,"source":"BleepingComputer","url":"https://www.bleepingcomputer.com/news/security/fortinet-warns-of-critical-fortimail-flaw-exploited-in-zero-day-attacks/","title":"Fortinet warns of critical FortiMail flaw exploited in zero-day attacks","summary":"Fortinet is warning customers of a critical FortiMail vulnerability, tracked as CVE-2026-104286, that is being actively exploited in zero-day attacks to execute unauthorized code or commands on vulnerable devices. [...]","thumbnail_url":null,"author":"Lawrence Abrams","published_at":"2026-10-01T22:42:49Z","fetched_at":"2026-10-01T22:51:54.815679Z","trending_score":0.00025707109845970495,"cve_ids":["CVE-2026-104286"]}],"references":[{"url":"https://fortiguard.fortinet.com/psirt/FG-IR-26-175","source_type":"VENDOR_ADVISORY","tags":["advisory"]}],"timeline":[{"type":"cisa_reported","at":"2026-10-01T00:00:00Z","label":"Added to CISA KEV catalog","source":"kev"},{"type":"published","at":"2026-10-01T19:17:38.938000Z","label":"CVE published","source":null},{"type":"first_article","at":"2026-10-01T22:42:49Z","label":"First news coverage","source":"BleepingComputer"}]}