CVE-2026-76466: Cisco TelePresence Video Communication Server…

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.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

0.38%

30.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-798

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

Vendor	Product	Versions
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; X8.7; X8.5.2; X12.5.9; X12.5.0; X8.10.4; X8.7.2; X12.5.5; X12.6.1; X12.6.2; X12.6.3; X12.6.4; X12.7.0; X12.7.1; X14.0.0; X14.0.1; X14.0.2; X14.0.3; X14.0.4; X14.0.5; X14.0.6; X14.0.7; X14.0.8; X14.2.0; X14.0.9; X14.2.1; X14.2.2; X14.0.11; X14.2.5; X14.0.10; X14.2.6; X14.2.7; X14.3.0; X14.3.1; X14.3.2; X14.3.3; X15.0.0; X14.3.4; X14.3.5; X15.0.1; X15.0.2; X15.0.3; X14.3.6; X15.2.0; X15.2.1; X15.2.2; X15.2.3; X14.3.7; X15.2.4.; X15.2.4; X15.3.0; X15.3.1; X15.3.2; X15.4.0; X15.5.0; X15.5.1; X15.5.2; X15.5.3

References

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-vcs-static-cred-hr7EWZ8t

Timeline

Published: Oct 21, 2026
Last Modified: Oct 22, 2026
Status: Awaiting Analysis

Frequently Asked Questions

What is CVE-2026-76466?

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.

How severe is CVE-2026-76466?

CVE-2026-76466 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 0.38% probability of exploitation in the next 30 days.

How do I fix CVE-2026-76466?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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