Severity: CriticalAction: Act nowExploitation: Exploited

Cisco patches new Secure Email Gateway zero-day exploited in attacks

Cisco has patched another actively exploited zero-day flaw in its Secure Email Gateway (SEG) that lets remote unauthenticated attackers execute commands with root privileges.

Excerpt from the primary source: BleepingComputer

Who is affected

Enterprises · Security professionals

Affected technology: Cisco networking & security

Why it matters

Source reporting says attackers are already exploiting this, so exposed Cisco networking & security systems are at immediate risk.

Automated: stated only from CISA listings and the exploitation evidence in the sources below.

What you should do · Act now

Treat this as an emergency. Identify every system running Cisco networking & security, apply the vendor's fix or published mitigations immediately, and check for signs of compromise. Patching alone does not remove an attacker who already got in.

Automated guidance based on this story's classification. Check the linked advisories for specifics.

Sources

We link to original and authoritative sources. Headlines and excerpts belong to their publishers.

Original reporting

Cisco patches new Secure Email Gateway zero-day exploited in attacks BleepingComputer · bleepingcomputer.com · Oct 14, 2026 · Primary source
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Apply the vendor's security update for Cisco networking & security.

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