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Cisco patches Secure Email Gateway zero-day exploited in attacks
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Fusion42 · 15 September 2026 · Fusion42 review
Cisco patched a critical zero-day vulnerability in its Secure Email Gateway that allows remote attackers to execute commands as root via crafted emails. The flaw is actively exploited in the wild and was added to CISA's Known Exploited Vulnerabilities Catalog with a federal patch deadline of three days.
This Wire brief sits within Fusion42's coverage of Cybersecurity.
◆ ◆ The Wire takeaway
You must patch Cisco Secure Email Gateway immediately to avoid root-level attacks exploiting this zero-day. The federal mandate marks this as a high-risk threat that could expose your organisation to full system compromise.
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1 source · 15 Sep 2026
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