Answer in brief
CVE-2026-76466 records a Critical severity (CVSS 9.8) vulnerability in Cisco Expressway Series Remote Code Execution Vulnerability. The current sources do not mark it as known exploited. The current feed maps Cisco/Cisco TelePresence Video Communication Server (VCS) Expressway (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 9.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Cisco/Cisco TelePresence Video Communication Server (VCS) Expressway (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Cisco/Cisco TelePresence Video Communication Server (VCS) Expresswaygeneric | 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 | Not reported |
Published upstream
Oct 21, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 21, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 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.
Quoted source text, attributed separately from HOL analysis.