CVE-2026-76466

CVE Enrichment

CVSS: 9.8 CRITICAL
CISA KEV: Not listed

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.

Technical Details

CVSS Version: 3.1
CNA / NVD Source: [email protected]
Published: 22-Oct-2026 00:19
Last Modified: 22-Oct-2026 01:54
CWE: CWE-798

CVSS Vector


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

References

[email protected]

Last enrichment sync: 22-Oct-2026 21:13
Sources: NVD · FIRST EPSS · CISA KEV
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Reported Context (1)

Expressway Series received fixes for 10 vulnerabilities, including a critical-severity remote code execution (RCE) bug tracked as CVE-2026-76466. Cisco Patches 34 Vulnerabilities Across Multiple Products

CVE (7)

Vendors (1)

Products (18)

Note: Related entities, including threat actors, malware, CVEs, MITRE ATT&CK techniques, vendors, products, tools, countries, and industries, are shown when they appear in the same reporting. Their presence does not necessarily mean they were targeted, compromised, vulnerable, responsible for the activity, or directly involved in the incident.