High Threat Security Alert (A26-10-05): Vulnerability in Fortinet FortiMail

Description:

Fortinet released a security advisory to address a vulnerability in Fortinet systems. An attacker could exploit this vulnerability by sending specially crafted requests to an affected system.

Reports indicated that a remote code execution vulnerability (CVE-2026-104286) is being exploited in the wild. System administrators are advised to take immediate action to patch your affected systems to mitigate the elevated risk of cyber attacks.

Affected Systems:

• FortiMail version 7.2.0 through 7.2.9, 7.4.0 through 7.4.8, 7.6.0 through 7.6.6, version 8.0.0 through 8.0.1

For detailed information of the affected products, please refer to the section 'Affected Products' of corresponding security advisory at vendor's website.

Impact:

Successful exploitation of the vulnerability could lead to remote code execution or tampering on an affected system.

Recommendation:

Patches for affected systems are available. System administrators of affected systems should follow the recommendations provided by the vendor and take immediate actions to mitigate the risk.

More Information:

• https://fortiguard.fortinet.com/psirt/FG-IR-26-175
• https://www.cisa.gov/news-events/alerts/2026/10/01/cisa-adds-one-known-exploited-vulnerability-catalog
• https://www.hkcert.org/security-bulletin/fortinet-products-remote-code-execution-vulnerability_20261002
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-104286