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Wire · regulatory

Root RCE Zero-Day in Cisco Secure Email Gateway Under Active Exploitation

15 September 2026 · By · Wire by Fusion42

Published

15 September 2026

Topic

regulatory

◆ Sectors

Cybersecurity

◆ Source

Read at securityweek.com →

◆ Verified

Fusion42 · 16 September 2026 · Fusion42 review

A critical remote code execution zero-day vulnerability in Cisco Secure Email Gateway is being actively exploited, posing severe risks to affected organisations.

This Wire brief sits within Fusion42's coverage of Cybersecurity.

◆ ◆ The Wire takeaway

You must patch or mitigate Cisco Secure Email Gateway immediately to prevent attackers exploiting this zero-day to breach your email defences. Delay risks losing control of your communications and critical data to active exploits.

◆ Coverage

1 source · 15 Sep 2026

◆ Related on Wire

◆ Topics

Cybersecurityzero-dayrceciscoemail-securityexploit