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CVE-2026-76466

Cisco Expressway Series Remote Code Execution Vulnerability

  • Critical 9.8

Description

A vulnerability in the database service feature of Cisco Expressway Series could allow an unauthenticated, remote attacker with network access to a Cisco Expressway device to execute arbitrary operating system commands as root. This vulnerability is due to the use of persistent cookies. Additionally, there is insufficient validation of client certificates when the TLS Verify Mode is set to Enabled for clustering, which means that client certificates are not validated. An attacker with possession of the cookies could exploit this vulnerability by connecting to the database service and invoking specific remote procedure call (RPC) commands. A successful exploit could allow the attacker to execute arbitrary commands as root on the underlying operating system of an affected device. Note: Cisco Expressway Series refers to Cisco Expressway Core (Expressway-C) devices and Cisco Expressway Edge (Expressway-E) devices.

Key facts

Published
21 Oct 2026
Last changed
22 Oct 2026
Assigned by
cisco
EPSS
0.417% likely to be exploited in the next 30 days, higher than 36.487% of CVEs (scores for 15 Nov 2026)
SSVC (CISA)
Exploitation: none; Automatable: yes; Technical impact: total

Severity scores

Each score is shown as its source gave it. They are not averaged or merged.

  • 9.8CVSS 3.1, Criticalfrom the CNA (cisco)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Historical context and remediation

This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.

No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.

No explicit remediation statement is available on this page yet. Consult the original record and vendor references before choosing a fix.

Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.

Read the original CVE record.

Affected products

VendorProductVersions
CiscoCisco TelePresence Video Communication Server (VCS) Expressway
  • Default status: unknown
  • X8.11.2 (affected)
  • X8.6 (affected)
  • X8.11.3 (affected)
  • X8.2.2 (affected)
  • X8.8.3 (affected)
  • X8.11.0 (affected)
  • X12.5.2 (affected)
  • X8.1.1 (affected)
  • X8.9 (affected)
  • X12.5.1 (affected)
  • X12.5.6 (affected)
  • X8.7.3 (affected)
  • X12.6.0 (affected)
  • X8.11.1 (affected)
  • X8.5 (affected)
  • X8.9.1 (affected)
  • X8.10.2 (affected)
  • X8.8.2 (affected)
  • X8.5.3 (affected)
  • X8.1 (affected)
  • X8.9.2 (affected)
  • X8.11.4 (affected)
  • X12.5.4 (affected)
  • X8.8.1 (affected)
  • X8.2.1 (affected)
  • X8.5.1 (affected)
  • X8.6.1 (affected)
  • X8.1.2 (affected)
  • X8.8 (affected)
  • X8.10.0 (affected)
  • X12.5.3 (affected)
  • X8.10.1 (affected)
  • X12.5.7 (affected)
  • X8.10.3 (affected)
  • X8.7.1 (affected)
  • X8.2 (affected)
  • X12.5.8 (affected)
  • X8.7 (affected)
  • X8.5.2 (affected)
  • X12.5.9 (affected)
  • X12.5.0 (affected)
  • X8.10.4 (affected)
  • X8.7.2 (affected)
  • X12.5.5 (affected)
  • X12.6.1 (affected)
  • X12.6.2 (affected)
  • X12.6.3 (affected)
  • X12.6.4 (affected)
  • X12.7.0 (affected)
  • X12.7.1 (affected)
  • X14.0.0 (affected)
  • X14.0.1 (affected)
  • X14.0.2 (affected)
  • X14.0.3 (affected)
  • X14.0.4 (affected)
  • X14.0.5 (affected)
  • X14.0.6 (affected)
  • X14.0.7 (affected)
  • X14.0.8 (affected)
  • X14.2.0 (affected)
  • X14.0.9 (affected)
  • X14.2.1 (affected)
  • X14.2.2 (affected)
  • X14.0.11 (affected)
  • X14.2.5 (affected)
  • X14.0.10 (affected)
  • X14.2.6 (affected)
  • X14.2.7 (affected)
  • X14.3.0 (affected)
  • X14.3.1 (affected)
  • X14.3.2 (affected)
  • X14.3.3 (affected)
  • X15.0.0 (affected)
  • X14.3.4 (affected)
  • X14.3.5 (affected)
  • X15.0.1 (affected)
  • X15.0.2 (affected)
  • X15.0.3 (affected)
  • X14.3.6 (affected)
  • X15.2.0 (affected)
  • X15.2.1 (affected)
  • X15.2.2 (affected)
  • X15.2.3 (affected)
  • X14.3.7 (affected)
  • X15.2.4. (affected)
  • X15.2.4 (affected)
  • X15.3.0 (affected)
  • X15.3.1 (affected)
  • X15.3.2 (affected)
  • X15.4.0 (affected)
  • X15.5.0 (affected)
  • X15.5.1 (affected)
  • X15.5.2 (affected)
  • X15.5.3 (affected)

Timeline

  1. 21 Oct 2026 Published

Weakness

Related coverage

References