CVE-2026-76466 Cisco Expressway Series Remote Code Execution Vulnerability
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-76466?
CVE-2026-76466 is a critical vulnerability in Cisco TelePresence Video Communication Server (VCS) Expressway, published on 21 Oct 2026.
Official 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.
Weakness: CWE-798
Which versions are affected by CVE-2026-76466?
How do I fix CVE-2026-76466?
No fix has been published for CVE-2026-76466 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-76466 being exploited?
There is no known exploitation of CVE-2026-76466 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Sources
Also known as GHSA-p2jr-qv63-hjch.