TI-2026-78826 Aliases CVE-2026-76466 GHSA-p2jr-qv63-hjch

Remote code execution in Cisco Expressway Series via database service

MEDIUM 49CWE-798Published 2026-10-21 · Updated 2026-10-22

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Security bypass
Confidentiality · integrity · availability: High · High · High
Fix status: No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-798.

Summary

Cisco TelePresence Video Communication Server (VCS) Expressway and Cisco Expressway Series devices are affected. The database service relies on persistent cookies and does not validate client certificates when clustering uses TLS Verify Mode Enabled (CWE-798). An unauthenticated remote attacker with network access can execute arbitrary operating system commands as root. An attacker holding the cookies can invoke specific RPC commands on the database service to reach this.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00417 36th percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
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	—	No fix listed	CNA

Cisco TelePresence Video Communication Server (VCS) Expressway VendorCisco Affected 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 Fixed in — No fix listed CNA

Remediation

The sources list no fixed version for Cisco TelePresence Video Communication Server (VCS) Expressway.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Timeline

2026-10-21 Threatist record created from CVE-2026-76466
2026-10-21 CISA SSVC decision points changed
2026-10-21 Alias added: GHSA-p2jr-qv63-hjch
2026-10-23 CISA SSVC decision points changed

References

Other 1

cisco-sa-vcs-static-cred-hr7EWZ8t

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TI-2026-53489 Cisco Secure Email Gateway SQL Injection Vulnerability KEVCVSS 3.1CRITICAL 9.8
TI-2026-53488 Cisco Identity Services Engine Authentication Bypass Vulnerability KEVCVSS 3.1CRITICAL 10.0
TI-2026-16388 Cisco Catalyst SD-WAN Controller Authentication Bypass Vulnerability KEVCVSS 3.1CRITICAL 10.0
TI-2026-16344 Cisco Secure Firewall Management Center Software Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 10.0

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Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences