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- 1Fortinet Warns of Zero-Day Attacks on FortiMail Systems▼Fortinet Warns of FortiMail Zero-Day Attacks As Critical Flaw Exposes Email Security Systems
Fortinet has issued a warning that attackers are actively exploiting a critical zero-day vulnerability in its FortiMail email security products. The flaw could allow compromise of systems that organizations rely on to filter and protect email. Administrators are being urged to apply patches and review their FortiMail deployments, as details about affected versions and exploitation methods continue to circulate in security advisories.
- 2Fortinet urges urgent patching of exploited FortiMail zero-day●🚨🐛 SIGINT // Cybersecurity Watch — 2026-10-03 Active exploitation of a FortiMail zero-day demands immediate patching—ema
Fortinet's FortiMail email security gateway is under active exploitation through a previously unknown vulnerability, prompting urgent calls for administrators to apply patches immediately. Security researchers warn that email gateways are prized targets because compromising them gives attackers a foothold into corporate networks and access to sensitive mail traffic.
- 3CISA adds actively exploited Fortinet FortiMail flaw to catalog●U.S. CISA adds Fortinet FortiMail flaw to its Known Exploited Vulnerabilities catalog
The U.S. Cybersecurity and Infrastructure Security Agency has added a vulnerability in Fortinet's FortiMail to its Known Exploited Vulnerabilities catalog, confirming the flaw is being actively abused in attacks. Inclusion requires federal civilian agencies to patch by the mandated deadline, and organizations running FortiMail are urged to update immediately.