Exploited FortiMail vulnerability: prioritise checking patch arrangements
HKCERT rates FortiMail CVE-2026-104286 as extremely high risk and reports exploitation in the wild. This alert concerns specific products and versions; it does not affect all Fortinet devices.
Basis: the official source labels this critical. GDMME follow-up priority uses official ratings and headline/summary rules. It is not a CVSS score or official vulnerability rating, and does not confirm that your business is affected.
Source severity
極高度風險（HKCERT）
Affected scope
FortiMail 8.0.0–8.0.1、7.6.0–7.6.6、7.4.0–7.4.8、7.2.0–7.2.9
Official recommendations
Automatically extracted recommendation passages from the official source, retained in the source language. Check the complete advisory.
- Before installation of the software, please visit the vendor web-site for more details.
- Apply fixes issued by the vendor:
- https://fortiguard.fortinet.com/psirt/FG-IR-26-175
The last successful extraction is used here. Check the official source for the latest content.
Source text collected (Hong Kong time)：2026/10/13 05:05 HKT
官方原文建議自動摘錄 未作逐篇人工分析或翻譯；請核對完整公告、現行版本及適用性
GDMME recommended actions
GDMME recommendations · automatically organised from explicit products and source signals, without individual human analysis. Confirm applicability against vendor guidance and your environment.
- Locate Fortinet deployments, running versions and service owners in your inventory or management console; compare them with the vendor applicability criteria. A named product does not mean every deployment is affected.
- Check internet-reachable management interfaces, VPN access and administrator accounts on Fortinet. Restrict unnecessary exposure using vendor guidance after confirming administration and remote-work needs.
- Once Fortinet applicability is confirmed, check the official excerpt and complete vendor patch/mitigation instructions. Record before/after versions, test results and rollback steps; do not install updates solely from a news headline.
- Review administrator sign-ins, configuration changes and VPN sessions on Fortinet against authorised changes. Preserve logs and use the incident procedure for unfamiliar admin accounts or unauthorised changes.
Automatically organised (Hong Kong time)：2026/10/13 23:05 HKT
Educational information only. Confirm affected versions, mitigations and exploitation status with the original vendor advisory. Reports do not imply that GDMME equipment blocks every vulnerability.