Back to Fastnexa
Under attack?
CyberBrief
Subscribe
Fastnexa

Cisco security advisory (AV26-1042) – Update 1

Used in attacksCriticalCanadian Centre for Cyber Security · Canadian Centre for Cyber Security·

At a glance

Severity
Critical
Used in attacks
Yes, 1 of 1 flaw named
Flaws named
CVE-2026-76519
Vendors and products
Cisco
Industries
Government
Reported by
1 outlet

As of October 14, 2026, Cisco is affected by vulnerabilities in the following products:

  • Cisco AsyncOS Software for Cisco Secure Email Gateway Release
    • 15.5 version prior to 15.5.5-014
    • 16.5 versions prior to 16.5.0-780
  • Cisco Secure Email and Web Manager Release
    • 15.5 version prior to 15.5.5-006
    • 16.5 versions prior to 16.5.0-429

Cisco has indicated that CVE-2026-76519 is being exploited in the wild.

Update 1

On October 14, 2026, Cybersecurity and Infrastructure Security Agency (CISA) added CVE-2026-76519 to their Known Exploited Vulnerabilities (KEV) Database.

The Cyber Centre encourages users and administrators to review the provided web links and apply any necessary updates as they become available.

Originally published by Canadian Centre for Cyber Security. © Canadian Centre for Cyber Security. Written by Canadian Centre for Cyber Security.

Read at cyber.gc.ca ↗Official Source

Vulnerabilities referenced

  • CVE-2026-76519Not scored yet

    Cisco Secure Email Gateway

    Cisco Secure Email Gateway contains a relative path traversal vulnerability that could allow an unauthenticated, remote attacker to write arbitrary files on the underlying operating system.

    Used in attacks

    Added to CISA's list 2026-10-14

    Full record →

Fastnexa security experts

This story involves a flaw attackers are already using. Are you exposed?

A Fastnexa penetration tester can check whether CVE-2026-76519 or anything like it can be used against your websites, apps and network.

Book a 30-min callWhatsApp us

Think you’ve already been hit? Don’t wait on a form: call or WhatsApp +1 (732) 454 2616. We reply within 1 hour, 24/7. Emergency help →

Coverage

One outlet has carried this so far.

  1. Canadian Centre for Cyber Security ↗Official SourceFirst reported

    2026-10-14 20:00 UTC

Related stories