9.8

CVE-2026-76466: cisco cisco telepresence video communication server (vcs) expressway Use of Hard-coded Credentials

CVSS: 9.8v3.1CriticalAwaiting analysis
Published 21-10-2026Last modified 21-10-2026
Open JSON

Vulnerability summary

CVE-2026-76466 is a critical (CVSS 9.8) Use of Hard-coded Credentials vulnerability in cisco cisco telepresence video communication server (vcs) expressway.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.8/10
010
Critical · v3.1 (CVE.org)
EPSS score
Not scored
0%100%
No EPSS score yet
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 21-10-2026
    PublishedVulnerability first disclosed.
  2. 21-10-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

No EPSS score has been published for this record yet.

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Cisco1 product
  • cisco telepresence video communication server (vcs) expresswayX8.11.2 | 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 | X15.3.0 | X15.3.1 | X15.3.2 | X15.4.0 | X15.5.0 | X15.5.1 | X15.5.2 | X15.5.3

1 vendor · 1 product

References

1 links