CVE-2026-104286
CriticalExploitedPublic exploitAn 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…
Published Oct 1, 2026 · Updated Oct 7, 2026 · Also known as EUVD-2026-91042, GHSA-6gxc-3vv7-7w24
Key Facts
Patch immediately- CVE-2026-104286 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting FortiMail (Fortinet).
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Oct 1, 2026. Public exploit code is available.
- EPSS estimates a 2.2% probability of exploitation in the next 30 days.
- Fixed versions are available, including FortiMail 7.4.8.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
9.8
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
EPSS (30-day exploit likelihood)
2.2%
Higher than 82.2% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2026-104286 brief as a PDF
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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.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Oct 1, 2026 | Oct 4, 2026 | Not reported |
| Industry KEV feed | Oct 1, 2026 | Oct 4, 2026 | Not reported |
| CIRCL KEV | Oct 1, 2026 | Oct 4, 2026 | Not reported |
| ENISA EUVD | Oct 1, 2026 | n/a | Not reported |
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.
Affected Products
36 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| FortiMailFortinet | 7.0.0, 7.0.1, 7.0.2, 7.0.3, 7.0.4, 7.0.5, 7.0.6, 7.0.7 | 7.4.8 |
Patched Releases
FortiMail
7.4.8
Timeline
Publicly disclosed
Oct 1, 2026
Added to CISA KEV
Oct 1, 2026
Added to Industry KEV feed
Oct 1, 2026
Added to CIRCL KEV
Oct 1, 2026
Added to ENISA EUVD
Oct 1, 2026
Last updated
Oct 7, 2026
Weakness Type
- CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
References
FAQ
Common Questions.
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…
Affected: FortiMail (Fortinet) versions 7.0.0, 7.0.1, 7.0.2, 7.0.3, 7.0.4, 7.0.5, 7.0.6, 7.0.7. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Oct 1, 2026.
Yes. It was added on Oct 1, 2026 with a federal remediation due date of Oct 4, 2026.
Public exploit code is available.
Fixed versions are available, including FortiMail 7.4.8.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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