CVE-2026-104286
9.8, critical Known exploitedFortinet FortiMail Path Traversal Vulnerability
- CVSS
- 9.8, critical critical CVSS v3.1
- EPSS, next 30 days
- 2% higher than 82.2% of scored CVEs
- Exploitation
- Confirmed in the wild
- Published
- 1 Oct 202616 days ago
Known exploited
CISA added this to the Known Exploited Vulnerabilities Catalog on 1 Oct 2026. US federal agencies had to remediate by 4 Oct 2026, a deadline that has passed.
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.
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.
Details
- Vendor
- Fortinet
- Product
- FortiMail
- Weakness
- CWE-22 (opens in a new tab)
- Status
- Analyzed
- Updated
- 7 Oct 2026
- Assigner
- psirt@fortinet.com
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
References 2
The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.
Other Fortinet CVEs
Every Fortinet CVE we holdSame vendor in what we hold, not a known link between the flaws.
- CVE-2026-25089 Fortinet FortiSandbox OS Command Injection Vulnerability KEV EPSS 76% 9.8, critical
- CVE-2026-39808 Fortinet FortiSandbox OS Command Injection Vulnerability KEV EPSS 47% 9.8, critical
- CVE-2025-61624 Fortinet Multiple Products Path Traversal Vulnerability KEV EPSS 0.6% 6.5, medium
- CVE-2026-35616 Fortinet FortiClient EMS Improper Access Control Vulnerability KEV EPSS 9% 9.8, critical
- CVE-2025-68686 Fortinet FortiOS Exposure of Sensitive Information to an Unauthorized Actor Vulnerability KEV EPSS 29% 5.9, medium
- CVE-2026-21643 Fortinet FortiClient EMS SQL Injection Vulnerability KEV EPSS 94% 9.8, critical
- CVE-2026-24858 Fortinet Multiple Products Authentication Bypass Using an Alternate Path or Channel Vulnerability KEV EPSS 86% 9.8, critical
- CVE-2025-25249 Fortinet Multiple Products Heap-based Buffer Overflow Vulnerability KEV EPSS 4% 9.8, critical
Beyond this page
Is CVE-2026-104286 in your network?
This page tells you how dangerous CVE-2026-104286 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.
CVE-2026-104286 is in the CISA catalogue of exploited vulnerabilities: attackers are already exploiting it.
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EXYS7600 OCELOT
Find it before attackers do
Ocelot scans your network on a schedule and reports every vulnerability it finds by its CVE identifier, with its CVSS score and how many of your hosts are affected. A finding like CVE-2026-104286 comes with the devices to patch.
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EXYS7950 KONDRA
Detect it if it's exploited
Until the patch is applied, Kondra monitors your network, events and endpoints in real time. It keeps an inventory of the software installed on every endpoint, and its anomaly detection rules flag what an attacker does once inside.
Learn more about EXYS7950 KONDRA
Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 17 Oct 2026, not the live upstream state.