Cisco Secure Email Gateway Zero-Day Exploited Again

Cisco Secure Email Gateway zero-day CVE-2026-76519: steel inspection box with an envelope in its slot and orange light leaking out

A Cisco Secure Email Gateway zero-day is under attack: one email with a crafted attachment lets an unauthenticated attacker write files and run commands as root. Cisco tracks it as CVE-2026-76519 (CVSS 9.8), and CISA added it to the Known Exploited Vulnerabilities catalog on October 14. It is the second Secure Email Gateway flaw exploited…

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