CVE-2026-104286

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.

Overview

State: PUBLISHED
Assigner (CNA): fortinet
CVSS severity: CRITICAL
CVSS score: 9.8 / 10
CVSS 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
Effective score: 9.8 / 10 CRITICAL source: CNA overview
CWE(s): CWE-22
Reserved: 2026-10-01
Published: 2026-10-01 19:17 UTC
Last updated: 2026-10-05 15:28 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/104xxx/CVE-2026-104286.json
Linked Threat: CVE-2026-104286 — Fortinet FortiMail: Fortinet FortiMail Path Traversal Vulnerability

CISA Known Exploited Vulnerabilities CISA KEV

CISA has confirmed in-the-wild exploitation of this CVE. Federal agencies must remediate by the due date below; private orgs should treat it as priority-1.

Vulnerability name: Fortinet FortiMail Path Traversal Vulnerability
Vendor / project: Fortinet
Product: FortiMail
Date added to KEV: 2026-10-01
Remediation due: 2026-10-04
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.
Ransomware campaign use: Unknown
CISA 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
CISA listing: www.cisa.gov/known-exploited-vulnerabilities-catalog

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published: 2026-10-01 20:17:24 UTC
NVD last modified: 2026-10-07 18:17:15 UTC
NVD CVSS v3.1: 9.8 / 10 CRITICAL source: psirt@fortinet.com
NVD CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Exploitability subscore: 3.9 / 10
Impact subscore: 5.9 / 10
EPSS score: 0.0220 (probability of exploitation in next 30 days)
EPSS percentile: 81.98% vs all CVEs — higher = more likely to be exploited, as of 2026-10-07

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID: EUVD-2026-91042
Assigner: fortinet
Published: Oct 1, 2026, 7:17:38 PM
Updated: Oct 7, 2026, 5:59:34 PM
EUVD base score (CVSS 3.1): 9.8 / 10
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
EUVD-reported EPSS: 2.2000
Vendors: Fortinet
Products: FortiMail (7.6.0 ≤7.6.5)

FortiMail (7.0.0 ≤7.0.9)

FortiMail (8.0.0)

FortiMail (7.2.0 ≤7.2.9)

FortiMail (7.4.0 ≤7.4.6)
Aliases: GHSA-6gxc-3vv7-7w24

ENISA 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.

EUVD references (1)

https://fortiguard.fortinet.com/psirt/FG-IR-26-175

Affected products (1)

Vendor	Product	Versions	Platforms
Fortinet	FortiMail	`8.0.0` (affected), `7.6.0` (affected), `7.4.0` (affected), `7.2.0` (affected), `7.0.0` (affected)	—

Affected products — CPE 2.3 (1) NVD

NVD's normalized CPE 2.3 matchers, used by vendor tools (vulnerability scanners, asset managers) for automated detection. Compare with the CNA's free-text "Affected products" section above.

cpe:2.3:a:fortinet:fortimail:*:*:*:*:*:*:*:*

Vendor references (1)

References embedded in the original CVE record by the assigning CNA.

https://fortiguard.fortinet.com/psirt/FG-IR-26-175

MITRE references (1) cveawg.mitre.org

Pulled from MITRE's CVE Services API by the 🛰 Backfill from MITRE button.

https://fortiguard.fortinet.com/psirt/FG-IR-26-175

Web references (0)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

No web references attached yet.

NVD-tagged references (2)

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

https://fortiguard.fortinet.com/psirt/FG-IR-26-175 psirt@fortinet.com MitigationVendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-104286 134c704f-9b21-4f2e-91b3-4a467353bcc0 US Government Resource

Indicators (3)

IOCs linked to the auto-promoted Threat row.

Type	Value	VirusTotal	Attached
cwe	`CWE-22`	no local data	2026-10-07 01:59 UTC
cve	`CVE-2026-104286`	no local data	2026-10-07 01:58 UTC
cwe	`CWE-158`	no local data	2026-10-07 01:59 UTC

Remediations (1)

Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.

CISA Required Action

CISA KEV

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. Due date: 2026-10-04 Known ransomware campaign use: Unknown

2026-10-06 23:35 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-104286.json.

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