CVE-2026-76466 is a vulnerability in Cisco Telepresence Video Communication Server
Published on October 21, 2026
Cisco Expressway Series Remote Code Execution Vulnerability
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.
Vulnerability Analysis
CVE-2026-76466 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to be critical as this vulnerability has a high impact to the confidentiality, integrity and availability of this component.
Weakness Type
Use of Hard-coded Credentials
The software contains hard-coded credentials, such as a password or cryptographic key, which it uses for its own inbound authentication, outbound communication to external components, or encryption of internal data.
Products Associated with CVE-2026-76466
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Affected Versions
Cisco TelePresence Video Communication Server (VCS) Expressway:- 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.