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Critical · 9.8 Public exploit CVE-2026-76466 EUVD-2026-107382GHSA-p2jr-qv63-hjch

Cisco Expressway Series Remote Code Execution Vulnerability

Published Oct 21, 2026 · Updated Oct 22, 2026 · Assigned by cisco

Vendor: Cisco Product: Cisco TelePresence Video Communication Server (VCS) Expressway Category: Network devices

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.

Affected products

VendorProductAffectedFixed
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X8.11.2, X8.6, X8.11.3, X8.2.2, X8.8.3, X8.11.0, X12.5.2, X8.1.1, X8.9, X12.5.1, X12.5.6, X8.7.3, X12.6.0, X8.11.1, X8.5, X8.9.1, X8.10.2, X8.8.2, X8.5.3, X8.1, X8.9.2, X8.11.4, X12.5.4, X8.8.1, X8.2.1, X8.5.1, X8.6.1, X8.1.2, X8.8, X8.10.0, X12.5.3, X8.10.1, X12.5.7, X8.10.3, X8.7.1, X8.2, X12.5.8… —

Public exploits

Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.

Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.

GitHub 1 repository

  • dinosn/cve-2026-76466 ★ 5 · Nov 5, 2026

    CVE-2026-76466: Cisco Expressway cluster database root RCE (CVSS 9.8) — Python exploit and fleet detector

Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.

Advisories 2

References