Vulnerability details
CVE-2026-76466
Cisco TelePresence Video Communication Server Expressway
Cisco Expressway Series Remote Code Execution Vulnerability
CVSS 3.1
9.8Critical
Official 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 scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 9.8Critical | 3.1 | CVEProject cvelistV5 (CNA) (cisco) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X12.5.0 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X12.5.1 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X12.5.2 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X12.5.3 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X12.5.4 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X12.5.5 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X12.5.6 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X12.5.7 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X12.5.8 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X12.5.9 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X12.6.0 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X12.6.1 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X12.6.2 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X12.6.3 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X12.6.4 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X12.7.0 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X12.7.1 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X14.0.0 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X14.0.1 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X14.0.10 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X14.0.11 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X14.0.2 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X14.0.3 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X14.0.4 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X14.0.5 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X14.0.6 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X14.0.7 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X14.0.8 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X14.0.9 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X14.2.0 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X14.2.1 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X14.2.2 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X14.2.5 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X14.2.6 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X14.2.7 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X14.3.0 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X14.3.1 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X14.3.2 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X14.3.3 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X14.3.4 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X14.3.5 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X14.3.6 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X14.3.7 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X15.0.0 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X15.0.1 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X15.0.2 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X15.0.3 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X15.2.0 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X15.2.1 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X15.2.2 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X15.2.3 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X15.2.4 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X15.2.4. | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X15.3.0 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X15.3.1 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X15.3.2 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X15.4.0 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X15.5.0 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X15.5.1 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X15.5.2 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X15.5.3 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X8.1 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X8.1.1 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X8.1.2 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X8.10.0 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X8.10.1 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X8.10.2 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X8.10.3 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X8.10.4 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X8.11.0 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X8.11.1 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X8.11.2 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X8.11.3 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X8.11.4 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X8.2 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X8.2.1 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X8.2.2 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X8.5 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X8.5.1 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X8.5.2 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X8.5.3 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X8.6 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X8.6.1 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X8.7 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X8.7.1 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X8.7.2 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X8.7.3 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X8.8 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X8.8.1 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X8.8.2 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X8.8.3 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X8.9 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X8.9.1 | CVEProject cvelistV5 (CNA) |
| Cisco | Cisco TelePresence Video Communication Server (VCS) Expressway | X8.9.2 | CVEProject cvelistV5 (CNA) |
References and advisories
1
Kolun on Telegram @kolunsec
Exploited CVEs, key news and a daily digest
Alerts for this product's next CVEsFollow the product to get new vulnerabilities on Telegram.
Details
- Published
- 2026-10-21
- Last updated
- 2026-10-23
- State
- Published
- Assigner (CNA)
- cisco
- Kolun priority
- 33 · Low
Exploit prediction (EPSS)
0.41%
Probability of exploitation in 30 days
36.2%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- None
- Technical impact
- Total
Weaknesses (CWE)
- CWE-798Use of Hard-coded Credentials