CVE-2026-104286

● Known-exploited CRITICAL

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...

CVSS 3.19.8
EPSS2.2%
Percentile82th
PatchUnknown
Known-exploited since2026-10-01
CVSS Vector — Plain English Remotely exploitable over the network, low complexity, no authentication required, no user interaction needed, impact contained to the vulnerable component, full confidentiality impact, full integrity impact, full availability impact.
CWE Weakness Definitions
CWE-22: Path Traversal

Attacker manipulates file path inputs to access files outside the intended directory.

Related Attack Patterns (CAPEC)
CAPEC-64 Using Slashes and URL Encoding Combined to Bypass Validation Logic
via CWE-22
CAPEC-76 Manipulating Web Input to File System Calls
via CWE-22
CAPEC-78 Using Escaped Slashes in Alternate Encoding
via CWE-22
CAPEC-79 Using Slashes in Alternate Encoding
via CWE-22
CAPEC-126 Path Traversal
via CWE-22

Mapping is CWE-to-CAPEC per MITRE CAPEC 3.9.

◆ AI Analysis — automated analysis, not human-reviewed

A critical severity vulnerability (CVE-2026-104286) affects the target system. 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 unauth...

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Frequently Asked Questions
What is CVE-2026-104286?
A critical severity vulnerability (CVE-2026-104286) affects the target system. 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 unauth...
What is the CVSS score for CVE-2026-104286?
CVE-2026-104286 has CVSS 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS: 2.2%.
Is CVE-2026-104286 actively exploited?
Yes. CVE-2026-104286 is in the CISA known-exploited catalog (added 2026-10-01). Active exploitation confirmed. Immediate patching required.
How do I remediate CVE-2026-104286?
Apply vendor patches for CVE-2026-104286. Monitor the vendor advisories.
Vulnerability Details
CVE IDCVE-2026-104286
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published2026-10-01
Last Modified2026-10-07
ICS Relevance15%
Weakness (CWE)
Path Traversal
SourceNVD
Official 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.

Source: NIST NVD / MITRE CVE Database

Affected Products
VendorProductAffected Versions
Fortinet Fortimail ≥ 7.2.0, ≤ 7.4.8 ≥ 7.6.0, ≤ 7.6.6 ≥ 8.0.0, ≤ 8.0.1
Remediation

No patch URL on record. Monitor vendor security advisories directly.

Threat Intelligence
● Threat Intelligence Validated: October 2026 | Threat Age: 7 Days
CISA known-exploited● Active Exploitation Confirmed (added 2026-10-01)
Public ExploitNot confirmed
PoC CodeNot confirmed

This Vulnerability Is Being Actively Exploited

CVE-2026-104286 is on the CISA known-exploited list - confirmed active exploitation in the wild. BreachSpider flags known-exploited CVEs on the ICS assets they affect, with known-exploited status synced daily from CISA.

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