CVE-2026-76466
Cisco Expressway Series Remote Code Execution Vulnerability
Reported by cisco · Published October 21, 2026
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.
Risk scores
Affected products
| Vendor | Product | Versions |
|---|---|---|
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X8.11.2, X8.6, X8.11.3 |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | 8.11.2, 8.6, 8.11.3 |
Timeline
- Oct 21, 2026 CVE Published
- Oct 22, 2026 EPSS Score (5 in total, the first dated here)
- Oct 22, 2026 Coalition ESS Score
Query this with the API
The same record, from the CLI:
vulnetix vdb vuln CVE-2026-76466
vulnetix vdb fixes CVE-2026-76466Or with curl, using the org id and key from your account page:
curl -s -H "Authorization: ApiKey ${VULNETIX_ORG_ID}:${VULNETIX_API_KEY}" \
"https://api.vdb.vulnetix.com/v2/vuln/CVE-2026-76466/fixes/registry"The Community plan is free and allows 50 queries a day. Get a free API key · API quickstart