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HighVulnerabilityCVE-2026-76494updated 27 Oct 2026, 14:49 UTC

Cisco Expressway code injection flaws fixed in October 2026 hardening release

Attackers could potentially inject and run unwanted code on Cisco Expressway video-collaboration servers. Cisco found these problems itself and has released a software update to fix them.

Exploited (Cisco PSIRT)Fix availableOfficial, 2 sources
SeverityHighCVSS 7.8 of 10
Being exploited?YesConfirmed by Cisco PSIRT · 27 Oct 2026
Fix available?YesCisco software update released in the October 2026 Expressway Security Hardening Release (specific fixed version not stated in the provided material). · since 27 Oct 2026
How sure is this?Official, 2 sourcesBacked by an official source

What happened

Cisco Expressway Core (Expressway-C) and Edge (Expressway-E) devices contain code injection flaws classified under CWE-94, found during an internal security review and grouped under CVE-2026-76494.

Why it is dangerous: Successful exploitation could let an attacker run code on the Expressway appliance, which sits in the path of voice and video calls. Organizations that expose Expressway-E to the internet are most at risk.

Are you affected?

You are affected if you run Cisco Expressway-C or Expressway-E devices with software versions before the October 2026 hardening release.

Cisco Expressway Series: Expressway-C and Expressway-E devices, prior to the October 2026 hardening release (exact versions unknown from the provided material).

What to do

  1. Check your Expressway-C and Expressway-E software version against the Cisco advisory cisco-sa-exwy-hardening-FhcqBVcs
  2. Install the Cisco October 2026 Expressway hardening release on all Core and Edge devices
  3. Confirm the upgrade on each device and review the advisory for the other related CVEs (CVE-2026-76490 to CVE-2026-76497)

Timeline

  1. 21 Oct 2026, 17:19 UTC
    Publicly disclosed
  2. 21 Oct 2026, 17:19 UTC
    Reported by NVD · NVD
  3. 27 Oct 2026, 14:49 UTC
    Cisco PSIRT reported on it · Cisco PSIRT
  4. 27 Oct 2026, 14:49 UTC
    Confirmed by Cisco PSIRT

Sources 2 reports, oldest first

Official vendor, government CERT or advisory database

Technical details

ID
CVE-2026-76494
CVSS
7.8 / 10
EPSS
0.2% chance of exploitation within 30 days
Disclosed
21 Oct 2026, 17:19 UTC
On Zero Radar
before the radar started
Last change
27 Oct 2026, 14:49 UTC

The plain-language parts and the attack diagram were written by an AI model (anthropic/claude-haiku-5.5) from the sources above. Facts like versions, exploitation and dates come from the sources themselves. How Zero Radar works

Cisco Expressway code injection flaws fixed in October 2026 hardening release · Zero Radar