CVE-2026-76466 PUBLISHED

Cisco Expressway Series Remote Code Execution Vulnerability

Assigner: cisco
Reserved: 19.08.2026 Published: 21.10.2026 Updated: 22.10.2026

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.

Metrics

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS Score: 9.8

Product Status

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

Exploits

The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.

References

Problem Types

  • Use of Hard-coded Credentials cwe