CVE-2026-76461: Active Exploitation of Cisco Secure Email Gateway Critical Zero-Day Vulnerability
Arctic Wolf Networks, Tuesday, September 15th, 2026
Arctic Wolf warns of active exploitation of a critical Cisco Secure Email Gateway zero-day and urges immediate mitigation.
Arctic Wolf issued a security bulletin on CVE-2026-76461, a critical zero-day vulnerability in Cisco Secure Email Gateway that is under active exploitation.
The advisory describes the affected versions, the nature of the flaw, and the risk to organizations running internet-facing email security appliances.
Arctic Wolf recommends immediate mitigation and patching rather than waiting for a scheduled maintenance window. The post includes observed exploitation context and guidance for detecting compromise.