CVE-2026-104286

Published Oct 1, 2026 CVSS 3.1 · 9.8 Critical EPSS 4.6% KEV · Listed

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, FortiMail 7.0 all versions may allow an unauthenticated attacker to write arbitrary files on the underlying system via crafted HTTP or HTTPS requests.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Fortinet

FortiMail

unaffected

Version	Status	Constraints
`8.0.0`	affected	≤ 8.0.1
`7.6.0`	affected	≤ 7.6.6
`7.4.0`	affected	≤ 7.4.8
`7.2.0`	affected	≤ 7.2.9
`7.0.0`	affected	≤ 7.0.9

Configuration 1 [-]

OR	cpe:2.3:a:fortinet:fortimail::::::::
	cpe:2.3:a:fortinet:fortimail::::::::
	cpe:2.3:a:fortinet:fortimail::::::::
	cpe:2.3:a:fortinet:fortimail::::::::
	cpe:2.3:a:fortinet:fortimail::::::::

No data.

Vendor Product Versions

Fortinet

Fortimail

Version	Status	Scheme	Platform
`8.0.0`	affected	semver	—
`[7.6.0,7.6.5]`	affected	semver	—
`[7.4.0,7.4.6]`	affected	semver	—
`[7.2.0,7.2.9]`	affected	semver	—
`[7.0.0,7.0.9]`	affected	semver	—

Remediation

Vendor Solution

Upgrade to FortiMail version 8.0.2 or above Upgrade to FortiMail version 7.6.7 or above Upgrade to FortiMail version 7.4.9 or above Upgrade to upcoming FortiMail version 7.2.10 or above

Tracking

Advisories

No advisories available

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is in the KEV database since Oct. 1, 2026.

Exploit prediction score: 4.6% (4.573% probability within 30 days)

Exploitation active

Automatable yes

Technical Impact total

References

Link	Providers
https://fortiguard.fortinet.com/psirt/FG-IR-26-175
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-104286

History

Oct 28, 2026 5:30 PM Description updated. Affected versions updated View changes

Type	Values Removed	Values Added
Description	An improper limitation of a pathname to a restricted directory ('path traversal') vulnerability in Fortinet FortiMail 8.0.0, FortiMail 7.6.0 through 7.6.5, FortiMail 7.4.0 through 7.4.7, FortiMail 7.2.0 through 7.2.9, FortiMail 7.0 all versions may allow an unauthenticated attacker to write arbitrary files on the underlying system via crafted HTTP or HTTPS requests.	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, FortiMail 7.0 all versions may allow an unauthenticated attacker to write arbitrary files on the underlying system via crafted HTTP or HTTPS requests.
CPEs		cpe:2.3:a:fortinet:fortimail:7.4.8:::::::* cpe:2.3:a:fortinet:fortimail:7.6.6:::::::* cpe:2.3:a:fortinet:fortimail:8.0.1:::::::*

Oct 28, 2026 3:30 PM Title updated View changes

Type	Values Removed	Values Added
Title	Unauthenticated Path Traversal Allowing Arbitrary File Write in FortiMail

Oct 28, 2026 1:30 PM Description updated. Affected versions updated View changes

Type	Values Removed	Values Added
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.	An improper limitation of a pathname to a restricted directory ('path traversal') vulnerability in Fortinet FortiMail 8.0.0, FortiMail 7.6.0 through 7.6.5, FortiMail 7.4.0 through 7.4.7, FortiMail 7.2.0 through 7.2.9, FortiMail 7.0 all versions may allow an unauthenticated attacker to write arbitrary files on the underlying system via crafted HTTP or HTTPS requests.
CPEs		cpe:2.3:a:fortinet:fortimail:7.4.7:::::::*

Oct 25, 2026 5:15 PM Title updated View changes

Type	Values Removed	Values Added
Title		Unauthenticated Path Traversal Allowing Arbitrary File Write in FortiMail

Oct 2, 2026 4:15 PM Title updated View changes

Type	Values Removed	Values Added
Title	Improper Pathname Restriction Allows Unauthenticated Arbitrary File Write in Fortinet FortiMail

Oct 2, 2026 12:45 PM Affected versions updated View changes

Type	Values Removed	Values Added
CPEs		cpe:2.3:a:fortinet:fortimail::::::::

Oct 1, 2026 9:45 PM Title updated View changes

Type	Values Removed	Values Added
Title		Improper Pathname Restriction Allows Unauthenticated Arbitrary File Write in Fortinet FortiMail

Oct 1, 2026 9:30 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics	ssvc `{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}`	ssvc `{'options': {'Automatable': 'yes', 'Exploitation': 'active', 'Technical Impact': 'total'}, 'version': '2.0.3'}`

Oct 1, 2026 8:30 PM Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
References		https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-104286
Metrics		ssvc `{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}`

Oct 1, 2026 8:00 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		kev `{'dateAdded': '2026-10-01T00:00:00+00:00', 'dueDate': '2026-10-04T00:00:00+00:00'}`

Oct 1, 2026 7:45 PM Description updated. First appearance in the feed. Weaknesses updated. Affected versions updated. Affected vendors updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
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.
First Time appeared		Fortinet Fortinet fortimail
Weaknesses		CWE-22
CPEs		cpe:2.3:a:fortinet:fortimail:7.0.0:::::::* cpe:2.3:a:fortinet:fortimail:7.0.1:::::::* cpe:2.3:a:fortinet:fortimail:7.0.2:::::::* cpe:2.3:a:fortinet:fortimail:7.0.3:::::::* cpe:2.3:a:fortinet:fortimail:7.0.4:::::::* cpe:2.3:a:fortinet:fortimail:7.0.5:::::::* cpe:2.3:a:fortinet:fortimail:7.0.6:::::::* cpe:2.3:a:fortinet:fortimail:7.0.7:::::::* cpe:2.3:a:fortinet:fortimail:7.0.8:::::::* cpe:2.3:a:fortinet:fortimail:7.0.9:::::::* cpe:2.3:a:fortinet:fortimail:7.2.0:::::::* cpe:2.3:a:fortinet:fortimail:7.2.1:::::::* cpe:2.3:a:fortinet:fortimail:7.2.2:::::::* cpe:2.3:a:fortinet:fortimail:7.2.3:::::::* cpe:2.3:a:fortinet:fortimail:7.2.4:::::::* cpe:2.3:a:fortinet:fortimail:7.2.5:::::::* cpe:2.3:a:fortinet:fortimail:7.2.6:::::::* cpe:2.3:a:fortinet:fortimail:7.2.7:::::::* cpe:2.3:a:fortinet:fortimail:7.2.8:::::::* cpe:2.3:a:fortinet:fortimail:7.2.9:::::::* cpe:2.3:a:fortinet:fortimail:7.4.0:::::::* cpe:2.3:a:fortinet:fortimail:7.4.1:::::::* cpe:2.3:a:fortinet:fortimail:7.4.2:::::::* cpe:2.3:a:fortinet:fortimail:7.4.3:::::::* cpe:2.3:a:fortinet:fortimail:7.4.4:::::::* cpe:2.3:a:fortinet:fortimail:7.4.5:::::::* cpe:2.3:a:fortinet:fortimail:7.4.6:::::::* cpe:2.3:a:fortinet:fortimail:7.6.0:::::::* cpe:2.3:a:fortinet:fortimail:7.6.1:::::::* cpe:2.3:a:fortinet:fortimail:7.6.2:::::::* cpe:2.3:a:fortinet:fortimail:7.6.3:::::::* cpe:2.3:a:fortinet:fortimail:7.6.4:::::::* cpe:2.3:a:fortinet:fortimail:7.6.5:::::::* cpe:2.3:a:fortinet:fortimail:8.0.0:::::::*
Vendors & Products		Fortinet Fortinet fortimail
References		https://fortiguard.fortinet.com/psirt/FG-IR-26-175
Metrics		cvssV3_1 `{'score': 9.8, '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'}`